Lippert RV Instruction Manual

RV Structural guidelines

Rev: 11.11.21 Page 2 CCD-0004203
TABLE OF CONTENTS
I-Beam (3/1/2021) 3
Stick and Tin 3
Stick and Tin Continued 4
Laminated Side Walls 4
Laminated Side Walls Continued 5
Crush Tube 6
Standard Crush Tubes/Riser Tubes ( 7/13/2021) 6
Crush Tubes Taller Than 2" including Extended Length Crush Tubes 6
The Extended Length Crush Tube 6
Chassis w/ Crush Tube 6
Draw Bar 7
Standard TT Draw Bar Engineering Guideline Rev. (6/15/2021) 7
Draw Bar 8
Toy Hauler TT Draw Bar Engineering Guidelines Rev: (6/15/2021) 8
Accepted Tube/I-Beam RV Engineering Guidelines Rev: (1/1/2020) 9
Outrigger 10
Engineering Guidelines Rev: (7/13/2021) 10
Hanger Support - Beam Stiener 11
Hanger Support Requirements (7/13/2021) 11
Axle Area - FHXM 12
Axle Area Full Height XMs Engineering Guidelines Rev: (1/1/2020) 12
Full Height Cross Member Requirements in the Axle Area 13
Upper Deck Main 14
Accepted Upper Deck RV Engineering Guidelines Rev: (3/1/2021) 14
Upper Deck Riser 15
Accepted Upper Deck RV Engineering Guidelines Rev: (3/1/2021) 15
Leveling 16
Accepted Leveling RV Engineering Guidelines - REV : (1/1/2020) 16
Accepted Travel Trailer Leveling RV Engineering Guidelines - REV : (1/1/2019) 17
Hydraulic Landing - Level Bracket 18
Accepted HYD Landing Gear and Leveling Bracket Supports Engineering Guidelines - REV: (3/1/2021) 18
5th Wheel Drop Gen set up. 19
Bumper Extension 20
Accepted Bumper Extension Engineering Guidelines - REV : (3/1/2021) 20
Slide-out Room Bar 21
Slide out/Room Bar Engineering Guidelines Rev: (3/1/2021) 21
Note: 22
Proprietary and Condential
The information contained in this document is the sole property of Lippert Components, Inc.
Any reproduction in parts or as a whole without the written permission of Lippert Components, Inc.
Is prohibited.

Rev: 11.11.21 Page 3 CCD-0004203
I-Beam (3/1/2021)
Stick and Tin
3.1 Stick and Tin Hung Glass Side Walls RV Engineering Guidelines
Conventional Travel Trailer
Max Main Rail
Length All
lengths are ≤
21' 25' 26' 27' 28' 29' 30' 31' 32' 33' 34' 35' 36' 37' 38' 39' 40' 41' 42'
252" 300" 312" 324" 336" 348" 360" 372" 384" 396" 408" 420" 432" 444" 456" 468" 480" 492" 504"
# Of Slides* Under 8K GVWR** Over 8K GVWR
0 6 6 6 6 8 8 8 8 8 8 8 8 8 8 10 10 10 12 12
1 6 8 8 8 8 8 8 8 8 10 10 10 10 10 10 10 10 12 12
2 8 8 8 8 10 10 10 10 10 10 10 12 12 12 12 12 12 12 12
3 10 10 10 10 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12
4 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12
3.3 Stick and Tin Hung Glass Side Walls RV Engineering Guidelines
Conventional 5th Wheel
Max Main Rail
Length All
lengths are ≤
21' 25' 26' 27' 28' 29' 30' 31' 32' 33' 34' 35' 36' 37' 38' 39' 40' 41' 42'
252" 300" 312" 324" 336" 348" 360" 372" 384" 396" 408" 420" 432" 444" 456" 468" 480" 492" 504"
# Of Slides*
0 8 8 8 8 8 8 10 10 10 10 10 10 10 10 12 12 12 12 12
1 8 8 8 8 8 10 10 10 10 10 10 10 10 10 12 12 12 12 12
2 8 8 8 8 10 10 10 10 10 10 10 10 10 10 12 12 12 12 12
3 8 8 10 10 10 10 10 10 10 12 12 12 12 12 12 12 12 12 12
4 10 10 10 10 10 10 12 12 12 12 12 12 12 12 12 12 12 12 12
3.2 Stick and Tin Hung Glass Side Walls RV Engineering Guidelines
Toy Hauler Travel Trailer
Max Main Rail
Length All
lengths are ≤
21' 25' 26' 27' 28' 29' 30' 31' 32' 33' 34' 35' 36' 37' 38' 39' 40' 41' 42'
252" 300" 312" 324" 336" 348" 360" 372" 384" 396" 408" 420" 432" 444" 456" 468" 480" 492" 504"
# Of Slides* Under 8K GVWR** Over 8K GVWR
0 6 6 8 8 8 10 10 10 10 10 10 10 10 10 12 12 12 12 12
1 6 8 8 8 10 10 10 10 10 10 10 12 12 12 12 12 12 12 12
2 8 8 8 10 10 10 10 10 10 12 12 12 12 12 12 12 12 12 12
3 10 10 10 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12
4 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12

Rev: 11.11.21 Page 4 CCD-0004203
Stick and Tin Continued
Laminated Side Walls
4.1 Stick and Tin Hung Glass Side Walls RV Engineering Guidelines
Toy Hauler 5th Wheel
Max Main Rail
Length All
lengths are ≤
21' 25' 26' 27' 28' 29' 30' 31' 32' 33' 34' 35' 36' 37' 38' 39' 40' 41' 42'
252" 300" 312" 324" 336" 348" 360" 372" 384" 396" 408" 420" 432" 444" 456" 468" 480" 492" 504"
# Of Slides*
0 8 8 8 8 8 8 10 10 12 12 12 12 12 12 12 12 12 12 12
1 8 8 8 8 8 10 10 12 12 12 12 12 12 12 12 12 12 12 12
2 8 8 8 8 10 10 12 12 12 12 12 12 12 12 12 12 12 12 12
3 8 8 10 10 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12
4 10 10 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12
4.2 Laminated Side Walls RV Engineering Guidelines
Conventional Travel Trailer
Max Main Rail
Length All
lengths are ≤
21' 25' 26' 27' 28' 29' 30' 31' 32' 33' 34' 35' 36' 37' 38' 39' 40' 41' 42'
252" 300" 312" 324" 336" 348" 360" 372" 384" 396" 408" 420" 432" 444" 456" 468" 480" 492" 504"
# Of Slides* Under 8K GVWR** Over 8K GVWR
0 6 6 6 6 8 8 8 8 8 8 8 8 8 8 10 10 10 12 12
1 6 6 8 8 8 8 8 8 8 10 10 10 10 10 10 10 10 12 12
2 8 8 8 8 8 8 10 10 10 10 10 10 10 10 12 12 12 12 12
3 8 8 8 10 10 10 10 10 10 12 12 12 12 12 12 12 12 12 12
4 10 10 10 10 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12
4.3 Laminated Side Walls RV Engineering Guidelines
Toy Hauler Travel Trailer
Max Main Rail
Length All
lengths are ≤
21' 25' 26' 27' 28' 29' 30' 31' 32' 33' 34' 35' 36' 37' 38' 39' 40' 41' 42'
252" 300" 312" 324" 336" 348" 360" 372" 384" 396" 408" 420" 432" 444" 456" 468" 480" 492" 504"
# Of Slides* Under 8K GVWR** Over 8K GVWR
0 6 6 6 8 8 8 10 10 10 10 10 10 10 10 12 12 12 12 12
1 6 8 8 8 8 10 10 10 10 10 10 10 12 12 12 12 12 12 12
2 8 8 8 8 10 10 10 10 10 10 12 12 12 12 12 12 12 12 12
3 8 8 10 10 10 12 12 12 12 12 12 12 12 12 12 12 12 12 12
4 10 10 10 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12

Rev: 11.11.21 Page 5 CCD-0004203
Laminated Side Walls Continued
5.1 Laminated Side Walls RV Engineering Guidelines Rev: 01.01.20
Conventional 5th Wheel
Max Main Rail
Length All
lengths are ≤
21' 25' 26' 27' 28' 29' 30' 31' 32' 33' 34' 35' 36' 37' 38' 39' 40' 41' 42'
252" 300" 312" 324" 336" 348" 360" 372" 384" 396" 408" 420" 432" 444" 456" 468" 480" 492" 504"
# Of Slides*
0 8 8 8 8 8 8 8 8 8 8 8 10 10 10 10 10 10 10 10
1 8 8 8 8 8 8 8 8 8 8 8 10 10 10 10 10 10 10 10
2 8 8 8 8 8 8 10 10 10 10 10 10 10 10 12 12 12 12 12
3 8 8 8 10 10 10 10 10 10 12 12 12 12 12 12 12 12 12 12
4 10 10 10 10 10 10 10 12 12 12 12 12 12 12 12 12 12 12 12
5.2 Laminated Side Walls RV Engineering Guidelines Rev: 01.01.20
Toy Hauler 5th Wheel
Max Main Rail
Length All
lengths are ≤
21' 25' 26' 27' 28' 29' 30' 31' 32' 33' 34' 35' 36' 37' 38' 39' 40' 41' 42'
252" 300" 312" 324" 336" 348" 360" 372" 384" 396" 408" 420" 432" 444" 456" 468" 480" 492" 504"
# Of Slides*
0 8 8 8 8 8 8 8 10 10 10 12 12 12 12 12 12 12 12 12
1 8 8 8 8 8 8 10 10 10 12 12 12 12 12 12 12 12 12 12
2 8 8 8 8 10 10 10 12 12 12 12 12 12 12 12 12 12 12 12
3 8 8 10 10 10 12 12 12 12 12 12 12 12 12 12 12 12 12 12
4 10 10 10 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12
Drop Deck Max Recommended Beam
Beam Size Max Drop Length
This dimension is measured from the front of the drop beam to the
front of the top stacked beam and does not include where the two
beams overlap. 24" of I-beam overlap is required.
6" 4.4# Beam 60" If GVWR is greater than 8K for a TT or 10K for a
5th wheel, then 8" 6.5# minimum
8" 6.5# Beam 101" If GVWR is greater than 18K, then 8" 10# minimum
8" 10# or 10" 8# Beam 142"
5.3 Units with a 1-¼" receiver hitch need to add 12" to current main rail length to determine I-beam size needed.
5.4 Units with a 2" receiver hitch or rear storage rack need to add 24" to current main rail length to
determine I-beam size needed.
A. * # Of Slides Include: In Frame Slide - In Wall Slide - Above Floor Slide - Outside Kitchen (excludes
slides in the upper deck).
- Outside Kitchen definition: if the opening in the sidewall is larger than 24 square feet or the
opening isn't fully framed inside the sidewall, then it must be counted as a slide out.
B. - Outside Kitchen examples of opening not being fully framed: bottom tube of sidewall removed/
cut out, main floors outside rail removed/cut out for outside kitchen to sit partially below floor.
5.5 Main rail length needs to include drop deck length.
5.6 When a 2" extended length crush tube is used, you can drop a main rail size. See notes in sec. 2.3 for
layout details.
C. ** If chassis meets length/slide count but doesn't meet the GVWR spec, then it must go up to 8"
I-beam size or use a 2" extended crush tube.

Rev: 11.11.21 Page 6 CCD-0004203
Crush Tube
Standard Crush Tubes/Riser Tubes ( 7/13/2021)
6.1 Need to extend a minimum of 2 ¼" past the end of the standard hangers and ½" past the end of
torsion hangers.
Set cross tubes ¼" in from the end of the crush tube.
2¼"2¼"
½"½"
354⁄"
40%
100%
Crush Tubes Taller Than 2" including Extended Length Crush Tubes
6.2 Standard length crush tubes ≤ 4" require a 2x2 - 11ga cross tube support at the front and rear of the
crush tube, also require two full height XMs in the axle area.
Note: Standard length crush tubes ≥ 5" require a 2x4 -11ga cross tube support at the front and rear of the
crush tube, also require two full height XMs in the axle area.
Note: Crush tube taller than 6" needs Lippert management approval.
The Extended Length Crush Tube
6.3 Start a minimum of 12" in front hanger or riser tube and extend 40% of the rear overhang. It also needs
to be rounded up to the nearest 12" increment.
Note: Extended length crush tubes ≥ 4" require a 2x2 - 11ga cross tube supports at the front and rear of
the axle area and extended length crush tubes ≥ 5" require a 2x4 - 11ga at the front and rear of the
axle area.
Chassis w/ Crush Tube
6.4 That are either a triple axle or using axles rated ≥ 8K, crush tube is required to be 7ga.
¼"
3"+
100%
382⁄"
40%
12"

Rev: 11.11.21 Page 7 CCD-0004203
Draw Bar
Standard TT Draw Bar Engineering Guideline Rev. (6/15/2021)
7.1 7.4
GVWR ≤ 50" BALL CENTER GVWR 54.5"-56" BALL CENTER
≤ 5,550 2X4 11GA ≤ 4,900 2X4 11GA
5,551 - 7,850 2X5 11GA 4,901 - 7,000 2X5 11GA
7,851 - 10,500 2X6 11GA 7,001 - 9,350 2X6 11GA
10,501 - 15,000 2X6 7GA 9,351 - 13,300 2X6 7GA
15,001 - 18,200 2X6 1/4GA 13,301 16,300 2X6 1/4GA
7.2 7.5
GVWR 50.5"-52" BALL CENTER GVWR 56.5"-58" BALL CENTER
≤ 5,300 2X4 11GA ≤ 4,800 2X4 11GA
5,301 - 7,550 2X5 11GA 4,801 - 6,700 2X5 11GA
7,551 - 10,000 2X6 11GA 6,701 - 9,000 2X6 11GA
10,001 - 14,000 2X6 7GA 9,001 - 12,900 2X6 7GA
14,001 - 17,500 2X6 1/4GA 12,901 -15,200 2X6 1/4GA
7.3 7.6
GVWR 52.5"-54" BALL CENTER GVWR 58.5"-60" BALL CENTER
≤ 5,150 2X4 11GA ≤ 4,600 2X4 11GA
5,151 - 7,250 2X5 11GA 4,601 - 6,500 2X5 11GA
7,251 - 9,700 2X6 11GA 6,501 - 8,700 2X6 11GA
9,701 - 13,800 2X6 7GA 8,701 - 12,500 2X6 7GA
13,801 -16,900 2X6 1/4GA 12,501 -15,200 2X6 1/4GA
For any guideline questions please contact: [email protected]

Rev: 11.11.21 Page 8 CCD-0004203
Draw Bar
Toy Hauler TT Draw Bar Engineering Guidelines Rev: (6/15/2021)
8.1 8.4
GVWR ≤ 50" BALL CENTER GVWR 54.5"-56" BALL CENTER
≤ 4,150 2X4 11GA ≤ 3,700 2X4 11GA
4,151 -5,900 2X5 11GA 3,701 - 5,250 2X5 11GA
5,901 - 7,850 2X6 11GA 5,251 - 7,000 2X6 11GA
7,851 - 11,200 2X6 7GA 7,001 - 10,000 2X6 7GA
11,201 - 13,700 2X6 1/4GA 10,001 - 12,200 2X6 1/4GA
8.2 8.5
GVWR 50.5"-52" BALL CENTER GVWR 56.5"-58" BALL CENTER
≤ 4,000 2X4 11GA ≤ 3,600 2X4 11GA
4,001 -5,650 2X5 11GA 3,601 - 5,050 2X5 11GA
5,651 - 7,550 2X6 11GA 5,051 - 6,750 2X6 11GA
7,551 - 10,800 2X6 7GA 6,751 - 9,650 2X6 7GA
10,801 - 13,100 2X6 1/4GA 9,651 -11,800 2X6 1/4GA
8.3 8.6
GVWR 52.5"-54" BALL CENTER GVWR 58.5"-60" BALL CENTER
≤ 3,850 2X4 11GA ≤ 3,450 2X4 11GA
3,851 - 5,450 2X5 11GA 4,101 - 4,900 2X5 11GA
5,451 - 7,250 2X6 11GA 4,901 - 6,550 2X6 11GA
7,251 - 10,400 2X6 7GA 6,551 - 9,350 2X6 7GA
10,401 -12,650 2X6 1/4GA 9,351 - 11,400 2X6 1/4GA
8.7 2x3 Draw bars require Lippert manager approval.
8.8 Please keep ball center to half inch increments.
8.9 Structural XMC can be used in place of tube draw bars in some instances; see Lippert management for
specific details.
8.10 Any chassis with I-beam mains and through mount drawbars where the GVWR/ball center requires
the drawbars to be the same height as the chassis mains, the chassis mains will need to go up a size or
change to undermount drawbar setup

Rev: 11.11.21 Page 9 CCD-0004203
Accepted Tube/I-Beam RV Engineering Guidelines Rev: (1/1/2020)
9.1 Non-Cargo - Hard Side Laminate Floors / Walls Tube & I-beam Chassis
Main Rail Length Feet <12' (camber
0-⁄") 13'-17' camber ⁄" 18'-22' (camber ⁄"-¼") 23'- 25' (camber ¼"-⁄")
Main Rail Length Inch. < 144" 145" - 215" 216" - 264" 265" - 300"
0 Slides 13ga/4" Tube 13ga/4" Tube 11ga/4" Tube 13ga/5" Tube or 6"
I-beam
(1) In-Wall Slide 13ga/4" Tube 11ga/4,13ga/5" Tube
or 6" I-beam
13ga/5" Tube or 6"
I-beam
11ga/5" Tube or 6"
I-beam
9.2 Non-Cargo - Wood Floors / Laminate Walls Tube & I-beam Chassis
Main Rail Length Feet <12' (camber
0-⁄") 13'-17' camber ⁄" 18'-22' (camber ⁄"-¼") 23'- 25' (camber ¼"-⁄")
Main Rail Length Inch. < 144" 144" - 215" 216" - 264" 265" - 300"
0 Slides 13ga/4" Tube 13ga/4" Tube 11ga/4",13ga/5"
Tube or 6" I-beam
13ga/5" Tube or 6"
I-beam
9.3 Non-Cargo - Stick & Tin Tube & I-beam Chassis
Main Rail Length Feet <12' (camber
0-⁄") 13'-17' camber ⁄" 18'-22' (camber ⁄"-¼") 23'- 25' (camber ¼"-⁄")
Main Rail Length Inch. < 144" 144" - 215" 216" - 264" 265" - 300"
0 Slides 13ga/4" Tube 11ga/4",13ga/5"
Tube or 6" I-beam
11ga/4",13ga/5"
Tube or 6" I-beam 11ga/5" or 6" beam
9.5 Pop Up Tent Campers
Main Rail Length Feet < 7.5' 7.5 - 16'
Main Rail Length Inch. <90" 91" - 192"
0 Slides 11ga/3" 13ga/4" Tube
For any guideline questions please contact: [email protected]
9.6 Please contact your current Lippert engineering team lead for all new tube chassis request.

Rev: 11.11.21 Page 10 CCD-0004203
Outrigger
Engineering Guidelines Rev: (7/13/2021)
10.1 Outrigger spacing should be 48" or less.
10.2 Need to have an outrigger on each end of the wheel well area.
10.3 Outrigger height needs to be greater than ½ the main rail height on I-beam frames and full height
on tube & XMC frames. Slide outriggers are an exception.
Slide Arms
Room Bar
FLOOR
A full length outrigger
should be located a maximum of
3" & 24" from notch in the main
floor at the beginning and end of
the slide-out opening
Must have two full length
outriggers in front of or behind
each slide-out.
Must have two full length
outriggers in front of or behind
each slide-out.
A minimum of two slide outriggers must be placed in the slide
out area. They need to be placed under the heaviest area
of the room. If the room is at least 144", a third outrigger is
required. Add an additional outrigger every 48" thereafter.
Must have two full length
outriggers in front of or behind
each slide-out.
Must have two full length
outriggers in front of or behind
each slide-out.
For a stick/tin build, we require a minimum of two slide
outriggers to be placed in the slide out area. They need
to be placed under the heaviest area of the room. If the
room is at least 72", a third outrigger is required. Add an
additional outrigger every 36" thereafter.
For a laminated build where rollers are mounted to the floor, we require a
minimum of two slide outriggers to be placed in the slide out area. They need
to be placed under the heaviest area of the room. If the room is at least 144", a
third outrigger is required. Add an additional outrigger every 48" thereafter.
Slide-out Room
FLOOR
A full length outrigger
should be located a maximum of
3" & 24" from notch in
the main floor at the beginning
and end of the slide-out opening
10.4 Through frame slide-out outrigger guidelines for stick and tin/hung glass & laminated sidewalls.
10.5 In wall floor slide-out outrigger guidelines for stick and tin/hung glass & laminated sidewalls.
10.6 For laminated builds where there is at least 6" of wall structure and rollers are mounted on the wall,
only standard outrigger placement will apply every 48".
10.7 If you have a 12 CU. FT. or larger refrigerator in a slideout, you are required to have two slide
outriggers centered under that section of the slideout, spaced no closer than 12” and no further than 36”.
If refer is near tires, both outriggers need to be placed as close as possible to the refer without causing tire
interference. All other slideout outrigger spacing is still applicable.
3" Max
24" Max
Slide-out Room
24" Max
3" Max