The Swagman E-Spec # S94FR that you were looking at is a great choice. The E-Spec can handle tires up to 3" wide and 29" in diameter, and weighing up to 70-lbs, so it will be able to handle your bikes with ease. This rack is confirmed for use on RVs like your Class C since it has a solid steel shank, and I really love that it comes with a hitch lock and locking clamps to secure both the bikes and the racks; this means that your investments are always going to be secured while you're traveling.... view full answer...