Just remember that almost all of the rear bumpers I have seen on campers were designed/built to hold a minimal load--such as a spare tire and the spare tire rack. "Grn Mtns" was correct stating that he
reinforced so that it would hold more weight. Go to the "Modifications" section to see what happened when I removed my spare tire carrier and adapted it to hold four bicycles. The new bike mount being built should be able to hold the bikes and riders.