There are some differences between the Hollywood Racks Sport Rider SE # HLY84FR and the Hollywood Racks RV Rider # HLY64FR. First off, the RV rider is constructed to be compatible with cars, trucks, vans, SUVs, fifth-wheel trailers, motorhomes, and flat-towed vehicles. The Sport Rider SE, on the other hand, is only rated for cars, trucks, vans, SUVs, and motorhomes. This does not affect you since you have a motorhome, but it is worth considering if you plan on using the racks on other vehicles.... view full answer...