The Model BC-108 four-bike, post-mount carrier can be used on motorhomes, travel trailers, and fifth wheels. While we recommend they be used with our Bike Bunk Model CC-275, 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. 120 lbs. weight capacity.