Apex Rage Powersports BC2BM RV/Camper Trailer Bumper Bike Rack for 1-2 Bicycles Transports 1-2 bicycles on an RV or camper trailer bumper (max 60 lb. capacity) Designed for 4" to 4.5" square RV bumpers, installs with (2) 6.5" U-bolts around the RV bumper 1.75"W Tire wells with 6.5" spacing between wells, 4.5" from bolt to first well Single L-style support tie-down 19.5"H brace (bicycle tie-downs sold separately) Heavy duty steel construction with a black paint finish