Installed a Cruiser Lift on back of my 35' Class A. Carry 2003 Harley Ultra Classic...you have to go by the formula provided by the lift company. Takes time and trouble to do. Mine came 124 lbs. under what the rig was rated for. Weighted front and back of rig after installation with rig loaded. Had on rv since 2008. Also installed air bags. I found a rig with no extension added to the frame...welding and wirng cost $ 1200.00. Traveled to a welding shop who have done this before....air bags REALLY help the swaying when big trucks
go past.....good luck..