The 4 bike post mount carrier can be used on Motorhomes, Travel Trailers and Fifth Wheels. This bike rack features an adapter sleeve to accommodate 1-1/4? and 2? hitch receivers, as well as an anti-rattle pin to reduce vibration during travel. Supports 200 Pounds Can Be Mounted To The Top Or Bottom Of Your Bumper Fits 4 Inch & 4-1/2 Inch Square Bumpers | Stromberg Carlson 2" Post Mount 4-Bike Rack in Black