We have a handful of 2" hitch mount bike racks from Thule, but only certain ones have been tested and approved for use on a motorhome so it does narrow down the list a little bit.
If you have bikes without front fenders then the best option is the Thule T2 Pro XTR # TH83JV because it's a platform rack that can handle up to 60 lb bikes and it's easier to install the bikes on a platform rack as opposed to a hanging rack. This comes with bike and rack locks for security and wheels on the... view full answer...