Install these on my 2008 Lexor which weighs 9500 lbs. Installation was easy, installation required removing the rear wheels, after that it took about 15 minutes to remove the old bumpers and install new sumo springs. Once installed, the RV's ride felt like a car. There is very little sideways rocking, the back rises about 1 1/2 inches, the front rises about 1 inch. They also eliminate most of the bouncing, swaying and swaying while riding. It was the best money I've ever spent. I recommend it to anyone who has a class B motorhome.I also hire the front ones. UPDATE FROM INSTALLATION OF YELLOW SPRINGS DRIVING IS VERY DIFFICULT ON ROUGH SURFACES. YELLOW IS NOT SUITABLE FOR THIS APP MUST BE BLACK SPRINGS POOR PRODUCT DESCRIPTION, AMAZON HELPS A LOT TO CORRECT. GIVES UPDATE AFTER INSTALLING THE CORRECT ITEMS. BLACK SOURCES
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