MDC MOD BOX 2021 User manual

1
Copyright © MDC Caravans and Campers INC 2021 All Rights Reserved
Phone: [phone]
OWNER’S MANUAL
U.S.A EDITION: 2021 - Version 1
MOD BOX
ROOFTOP TENT CAMPER
www.mdcusa.com
* 2021 Model shown

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Copyright © MDC Campers and Caravans Inc. 2020 All Rights Reserved
All les and information contained in this Owner’s Manual are copyright protected by MDC Campers and Caravans Inc.
(collectively, “MDC”), and may not be duplicated, copied, modied, or adapted, in any way without our written
permission. This Owner’s Manual may contain MDC service marks or trademarks as well as those of MDC afliates or
other companies, in the form of words, graphics, and logos. Your use of this Owner’s Manual does not constitute any
right or license for you to use MDC’s or any other party’s service marks or trademarks, without the prior written
permission of MDC or the applicable party. MDC’s content, as found within this Owner’s Manual, is protected under US
and foreign copyright laws. The copying, redistribution, use or publication by you of any such content, is strictly
prohibited. Your use of this Owner’s Manual does not grant you any ownership rights to the content of this Owner’s
Manual.
DISCLAIMER: This Owner’s Manual is provided in good faith, and MDC may amend or update this Owner’s
Manual from time to time at MDC’s discretion.
Use of Product
The intent and purpose of this Owner’s Manual is to assist owners in the correct use and operation of camper trailers
and caravans (the “Product”) and outline the servicing schedule to be followed in order to ensure the correct
maintenance of the Product.
Servicing
Servicing information contained in this Owner’s Manual is provided for those who have appropriate technical skills
in regard to maintenance and repairs. The servicing content of this Owner’s Manual assumes a satisfactory technical
knowledge,as well as mechanical skills and experience, therefore, it is not suitable for people who are not trained or
qualied in the subject matter with which it deals.
If you do not have the appropriate skills and experience, or if you do not have access to appropriate tools and
equipment, you may injure yourself or others around you and/or you may cause damage to the Product you are work-
ing on, including making it unsafe.
Users of this Owner’s Manual must:
a. Read all content thoroughly. It is especially important to have a good understanding of all of the contents
shown in the INTRODUCTION and SAFETY Sections of this Owner’s Manual.
b. Use only the correct tools and equipment for all repairs and servicing.
c. If part replacement is necessary, replace the part with the same part number or equivalent part. DO NOT
replace it with a part of inferior quality. If you have any questions, please contact us at: 1-833-632-8721
d. Observe all ‘Cautions’ and ‘Notices’ to reduce the risk of personal injury during service or repair, or improper
service or repair, that may damage the Product or render it unsafe.
e. Understand that the ‘Cautions’ and ‘Notices’ in this Owner’s Manual are not exhaustive because it is
impossible to warn of all possible hazardous consequences that might result from failure to follow the
instructions in this Owner’s Manual.
f. You must carry out your own risk assessments as you work.
MDC does not warrant against and does not accept any or all liability (whether for personal injury, death, illness,
property damage or other losses or damages) which may arise because a user of this Owner’s Manual failed to follow
directions set forth in this Owner’s Manual or to follow other safe work methods associated with use and
maintenance of the Product. This Owner’s Manual is subject to the MDC Limited Warranty found at:
www.mdcusa.com
Those without the required skills, knowledge, tools, and experience to work on and maintain the Product should seek
the services of a suitably qualied person or business. This Owner’s Manual is based on the latest Product information
at the time of release. However, specications and procedures are subject to change without notice. Any updates to this
Owner’s Manual may be found at:
www.mdcusa.com
Ph: 833 632 8721

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My Mod Box Camper
DISCLAIMER: By receiving this handbook, you confirm there you have read and agree to all
the terms and conditions and understood the use and maintenance care of MDC Campers and
Caravans Inc.
NAME:
MODEL:
VIN:
BUILD DATE:
DRY WEIGHT:
GTW:
TIRE SIZE:
DEALER PH:
ADDRESS 1:
ADDRESS 2:

www.mdcusa.com Ph: 833 632 8721 Contents
General Safety Information...................................................6
Safety Alert Symbols and Signal Words........................6
Reporting Safety Defects ...................................................7
Tow vehicle and Trailer Compatibility ...........................7
Terminology & Abbreviations ...........................................8
Tire Safety Information........................................................ 10
Steps for Determining Correct Load Limit-Trailer . 10
Trailers 10,000 Pounds GVWR or Less.................. 10
Steps for Determining Load Limit-TOW VEHICLE 11
Tire Safety - Everything Rides on it ............................. 11
Safety First - Basic Tire Maintenance...................... 11
Finding Your Vehicles Recommended Tire
Pressure and Load Limit .............................................. 11
Understanding Tire Pressure and Load Limits .... 12
Checking Tire Pressure................................................. 12
Steps for Maintaining Proper Tire Pressure ......... 12
Tire Size............................................................................... 12
Tire Tread ........................................................................... 13
Tire Balance and Wheel Alignment.......................... 13
Tire Repair.......................................................................... 13
Tire Fundamentals.......................................................... 13
2.3.10.1 Information on Passenger Vehicle Tires13
Treadwear Number UTQGS Information.............. 14
Additional Information on Light Truck Tires......... 15
Tire Safety Tips ................................................................ 15
Tire Pressure Table............................................................. 16
Propane Safety........................................................................ 16
Gas Certication ................................................................. 16
General Safety ..................................................................... 16
Propane Cylinder Safety .................................................. 17
Gas Appliance Safety......................................................... 17
Electrical Safety ...................................................................... 18
Shore Power.......................................................................... 18
GFI Safety Switch................................................................ 18
General Safety......................................................................... 19
Brakes...................................................................................... 19
Brake Controller.............................................................. 19
Brake Maintenance and Adjustment....................... 19
Maintenance ..................................................................... 19
Jacking Your Trailer............................................................ 20
Trailer Specications............................................................. 21
MDC Contract Details and Stores ............................... 21
Using Your Trailer................................................................... 22
Instructional Videos .......................................................... 22
Setting up Kitchen and Electrical.................................. 22
Packing Away Your Camper ........................................... 22
Connecting to the Tow Vehicle...................................... 23
Towing with Trucks and Buses ................................... 23
Hitch......................................................................................... 23
Connecting Wiring.......................................................... 24
Connecting the Safety Chains.................................... 24
Loading Your Trailer........................................................... 25
Pre-Trip Inspection............................................................. 25
Operating Trailer Features.............................................. 26
Stabilizer Legs................................................................... 26
Connecting Shore Power ............................................. 26
Towing Your Trailer................................................................ 27
Speed and Road Conditions............................................ 27
Trailer Sway........................................................................... 27
Fatigue..................................................................................... 27
Daily Checks ......................................................................... 27
Correct Wiring of Tow Vehicle ...................................... 28
Choosing a Camp Site........................................................ 29
Inclement Weather......................................................... 29
Care and Maintenance of the Trailer ..............................30
Protection of Finishes .......................................................30
Corrosion Protection.....................................................30
Winterizing the Trailer..........................................................30
Post Winter...........................................................................30
Trailer Body Maintenance................................................... 31
Mechanical Maintenance .................................................... 31
Wheels and Tires ................................................................ 31
Brakes...................................................................................... 31
Brake Adjustment............................................................... 31
Brake Cleaning and Inspection...................................... 31
Magnets.................................................................................. 32
Table of Contents

www.mdcusa.com Ph: 833 632 8721 Contents
Shoes and Linings................................................................ 32
Bearings and Seals .......................................................... 33
Suspension......................................................................... 33
Handbrake ......................................................................... 33
Adjuster...............................................................................34
Hitch.....................................................................................34
Ball Bearing Slides........................................................... 35
Plumbing .................................................................................... 35
Fresh Water Tanks.......................................................... 35
Toilet Care and Maintenance...................................... 35
Hub Assembly ...................................................................... 36
Trailing Arms and Bushes................................................. 37
Service Record and Schedule ............................................38
Travel Record........................................................................46
Warranty Policy ......................................................................48

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General Safety Information
Safety Alert Symbols and Signal Words
This owner manual provides general information only for the model depicted. You must read, follow and understand the
instructions of all third party tments, appliances and accessories as well as the manufacturers information contained in
this manual.
MDC trailers are manufactured using many third party supplied products which have separate manuals. These manual
must be read in conjunction with this document and all instructions followed. If your trailer does not have additional
manuals included, contact Market Direct Group on 1-833-632-8721
Safety information in this manual is denoted by
Risk level is indicated by the following Signal Words.
DANGER – Immediate hazards which WILL result in severe personal injury or
death if the warning is ignored
DANGER
WARNING – Hazards or unsafe practices which COULD result in severe personal
injury or death if the warning is ignored
WARNING
DANGER – Hazards or unsafe practices which could result in minor or moderate
injury if the warning is ignored
CAUTION
DANGER – Practices that could result in damage to the trailer or other property
NOTICE

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Reporting Safety Defects
If you believe that your vehicle has a defect that could cause a crash or could cause injury or death, you should
immediately inform the National Highway Trafc Safety Administration (NHTSA) in addition to notifying MDC Caravans
and Campers INC.
If NHTSA receives similar complaints, it may open an investigation, and if it nds that a safety defect exists in a group of
vehicles, it may order a recall and remedy campaign. However, NHTSA cannot become involved in individual problems
between you, your dealer, or Market Direct Group.
To contact NHTSA, you may either call the Vehicle Safety Hotline toll-free at 1-888-327-4236 (TTY: 1-800-4249153),
go to http://www.nhtsa.gov; or write to: Administrator, NHTSA, 400 Seventh Street. SE., Washington, DC 20590. You
can also obtain other information about motor vehicle safety from http://www.nhtsa.gov. Call 1-833-632-8721 to reach
MDC Caravans and Campers INC.
Tow vehicle and Trailer Compatibility
Your tow vehicle manufacturer has applied a maximum towing capacity to the vehicle which is the Gross Trailer Weight
(GTW) and a maximum Gross Combined Weight Rating (GCWR). These specications MUST NOT be exceeded. It is
your responsibility to know, understand and follow these specications. Vehicle manufacturers may also specify or
recommend “Weight Distribution Bars” when towing under certain conditions. You MUST ensure this is compatible
with the vehicle and trailer combination.
DANGER – Exceeding manufacturer weight and combination limits can
result in loss of control leading to death or serious injury. Your tow vehicle
and hitch must be rated for the Gross Vehicle Weight of the trailer.
DANGER

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Coupling Mass
ScaleReading = Dry Weight
Scale
Coupling Mass
Reading must not exceed GVW Rating
Load
Coupling Mass
Reading must not exceed GCWR Rating
Total Load of Trailer Total Load of Tow Vehicle
Scale
Terminology & Abbreviations
Dry Weight: The total weight of the trailer (load on tires plus coupling load) with all options and ttings as supplied by
the manufacturer, with empty water tanks, excluding uids not essential for operation on public roads, and without
luggage or personal effects.
GVW (Gross Vehicle Weight) Rating: The total permissible mass of the Trailer. This includes the tongue/coupling mass
and whatever you add as payload (e.g. water, gas, luggage) up to the specied rating. The GVW Rating must not be
exceeded.
GCWR (Gross Combination Weight) Rating: The total permissible mass that can be supported by the wheels/ tires of
the Tow Vehicle and Trailer Combination. This includes whatever you add as payload (e.g. water, gas, equipment, and
luggage), and total weight of the tow vehicle. The GTM Rating must not be exceeded.
Campers for illustration purposes only.

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Terminology & Abbreviations
Tongue Weight: The downward load exerted on the tow point of the vehicle by the trailer. (Coupling Mass)
GVW (Gross Vehicle Weight): The total mass of the trailer and cargo
GVWR (Gross Vehicle Weight Rating): Maximum rated total mass of trailer and cargo.
GCWR (Gross Combination Weight Rating): This is the total allowable combined mass of tow vehicle and trailer as
determined by the tow vehicle manufacturer.
Camber: Camber angle is the measure in degrees of the difference between the wheel’s vertical alignment
perpendicular to the surface. If a wheel is perfectly perpendicular to the surface, its camber would be 0 degrees.
Camber is described as negative when the top of the tire begins to tilt inward towards the chassis rail.
Your MDC trailer should be 0-0.5 degrees negative camber.
Toe In/out: Negative toe, or toe out, is the front of the wheel pointing away from the centerline of the vehicle. Positive
toe, or toe in, is the front of the wheel pointing towards the centerline of the vehicle. Toe can be measured in linear units,
at the front or rear of the tire, or as an angular deection. In the case of MDC products, the “toe in”
is measured in degrees or 64th’s of an inch at the front of the tire from the chassis rail.
Your MDC trailer should have toe in set at 3/64” to 5/64” over the diameter of the tire.

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Tire Safety Information
This section of the User Manual contains tire safety information as required by 49 CFR 575.6.
“Steps for Determining Correct Load Limit – Trailer”
“Steps for Determining Correct Load Limit – Tow Vehicle”
Section 2.3 has information from the NHTSA brochure titled “Tire Safety – Everything Rides On It”
The following brochure information is contained:
• Tire labeling, including a description and explanation of each marking on the tires, and information
about the DOT Tire Identication Number (TIN).
• Recommended tire ination pressure, including a description and explanation of:
A. Cold ination pressure.
B. Vehicle placard and location on the vehicle.
C. Adverse safety consequences of under ination (including tire failure).
D. Measuring and adjusting air pressure for proper ination.
• Tire Care, including maintenance and safety practices.
• Vehicle load limits, including a description and explanation of the following items:
A. Locating and understanding the load limit information, total load capacity and cargo capacity.
B. Calculating total cargo capacities with varying seating congurations including quantitative
examples showing / illustrating how the vehicles cargo and luggage capacity decreases as
combined number and size of occupants increases. This item is also discussed in Section 3.
C. Determining compatibility of tire and vehicle load capabilities.
D. Adverse safety consequences of overloading on handling and stopping on tires.
Steps for Determining Correct Load Limit - Trailer
Trailers 10,000 Pounds GVWR or Less
1. Locate the statement “The weight of cargo should never exceed XXX kg or XXX lbs” on your Vehicles
placard. See gure 1-1
2. This gure equals the available amount of cargo and luggage load capacity.
Tire and Loading Information Placard - Figure 1-1
3. Determine the combined weight of luggage and cargo being loaded on the vehicle. That weight may
not safely exceed the available cargo and luggage load capacity.
The trailer’s placard refers to the Tire Information Placard attached adjacent to or near the trailer’s VIN (Certication)
label at the left front of the trailer.
Note: The following calculations in Sections 2.1.2 and 2.2 are not required by the government. For the purpose of
completeness, NATM has included these statements.