The post mount carrier can be used on Motorhomes, Travel Trailers and Fifth Wheels. While we recommend they be used with our Bike Bunk, they will also work in any of our accessory hitches. The Model BC-108 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. Fits 1-1/4" & 2" receivers