Quick Products QPRBM2R RV Bumper-Mounted 2-Bike Rack with Adjustable Width and Stabilizer PostPut that RV bumper of yours to use and add some fun to your trips with the Bumper-Mounted 2-Bike Rack from Quick Products! The rack features two platforms that easily mount to your 4" to 4.5" square bumper and give you completely customizable control over ..