RV & Trailer Retrofit Kits

Trailer Retrofit Kits

MODIFIES YOUR TRAILER SUSPENSION TO ACCOMODATE SHOCKS

For trailers that have either a leaf spring suspension or a torsion axle suspension, Monroe manufactures the Retrofit Kit.

Adding Monroe RV shocks reduces the bounce and wander of your trailer for improved towing capacity. Monroe RV shocks also reduce the surge caused by trailer motion feedback to the tow vehicle, for a smoother, more comfortable ride. Recommended for use with Monroe RV shock absorbers for a softer, more controlled ride.

Make towing easier, better and safer with the Monroe RV Retrofit kit.

Easily installed without welding or special tools, this do-it-yourself kit enables modification of your trailer suspension to accomodate Monroe RV shock absorbers.

Easy Installation:

Determine the frame type

Determine the diameter of your axle (leaf springs) Determine specific GVW rating of your trailer suspension (torsion axle)
Based on the axle diameter/GVW rating from step 2, locate the correct retrofit kit from the corresponding chart below
Determine the location of the upper mounting. Measure the distance between the upper and lower mountings.Based on the centerline dimension at the vehicle static height. Dimension should be taken with trailer on level surface.
Using the measurement from step 4, select the appropriate Magnum RV shock absorber from the third chart below.

Leaf Spring Suspension
Axle Diameter*	Rectangular Tube Frame 2" width x any height	C-Channel Frame with channel OUT	C-Channel Frame with channel IN
1500/2500 lb axle 1-3/4" to 2" axle & 1-3/4" spring width (reference: typically having 10" to 13" wheels with 4 or 5 lugs)	RB514	RB514	RB514 plus RB513
3500/4600 lb axle with 2-3/8" to 2" axle & 1-3/4" spring width (reference: typically having 13" to 15" wheels with 5 lugs)	RB511	RB511	RB511 plus RB513
5000/5600 lb axle with 3" axle & 1-3/4" spring width (reference: typically having 15" wheels with 6 lugs)	RB512	RB512	RB512 plus RB513
7000 lb axle with 3" axle & 1-3/4" spring width (reference: typically having 16" or 16.5" wheels with 8 lugs)	RB512	RB512	RB512 plus RB513

* with leaf spring suspension. Will not fit applications with torsion axle.

Torsion Axle Suspension
Suspension Type*	Rectangular Tube Frame 2" width x any height	C-Channel Frame with channel OUT	C-Channel Frame with channel IN
1500/2500 lb GVW axle reference: typically having 10" to 13" wheels with 4 or 5 lugs)	RB516	RB516	RB516 plus RB513
3500 lb GVW axle (reference: typically having 13" to 15" wheels with 5 lugs)	RB517	RB517	RB517 plus RB513
5000 lb GVW axle (reference: typically having 13" to 15" wheels with 6 lugs)	RB518	RB518	RB518 plus RB513
7000 lb GVW axle reference: typically having 16" or 16.5" wheels with 8 lugs)	N/A	N/A	N/A

* with torsion axle suspension. Will not fit applications with leaf spring.

Magnum RV Shock Absorbers
Static Length	Monroe P/N	Comment	Typical Axle Use
10" to 11-1/4"	555002	Shocks absorbers are packaged as a single piece. You will need to obtain a pair for each axle.	1500-3500 lb
11-3/8" to 13-1/4"	555003		2500-4600 lb
13-3/8" to 15-1/2"	555004		2500-5000 lb
15-5/8" to 16-3/4"	555005		3500-7000 lb
16-7/8" to 20"	555006		4600-7000 lb

If trailer was originally equipped with shock absorbers, refer to the following chart

Original P/N	Monroe P/N	Comment	Typical Axle Use
19176	555001	Shocks absorbers are packaged as a single piece. You will need to obtain a pair for each axle.	Original Replacement
18864	555002		Original Replacement
199188	555025		Original Replacement
UO109-1	555025		Original Replacement