Maybe get both and have reciever hitch welded to front of RV to carry bike on rack in front? Less overhang, possibly better handling and weight balance. Bike might stay cleaner in front, and you can tell sooner if anything is getting loose. Some of those class c have very long rear overhangs that would pitch bike up and down significantly over bumps.
Downside? Bike in front might block some headlights, cooling and under hood access.