RV 4" Square Bumper-Mounted Cargo Box Support Arms Bracket Black | eBay
RV Bumper Hitch with 2" Receiver (Fits 2" x 4" Bumper Beams) SKU #19101 for $81.31 by CURT Manufacturing
Amazon.com: Camco No Insect RV Bumper Cap | Features Vent Holes | Squeeze Grip for Easy Installation and Removal | Durable Construction | (40325) : Automotive