I'm not sure if these kit is still available from Monroe. They may have been discontinued. Not sure. An on-line inquirey
to Monroe Tech Support may help.
RV & Trailer Retrofit Shock Kits
MODIFIES YOUR TRAILER SUSPENSION TO ACCOMMODATE SHOCKS
Torsion Axle Suspension.
C-Channel Frame with channel facing IN (this will fit your "I" beam trailer frame
1500/2500 lb GVW axle reference: typically having 10" to 13" wheels with 4 or 5 lugs)
: RB516 plus RB513
3500 lb GVW axle (reference: typically having 13" to 15" wheels with 5 lugs)
: RB517 plus RB513
* with torsion axle suspension. Will not fit applications with leaf spring.
Click on the link below for more information.
RV & Trailer Retrofit Kits