We have always used a ladder rack with no problems, but I'm reconsidering after hearing about problems others have had. I like the roof rack idea, except that it looks like a lot of trouble to get the bikes up there and back down. I also worry about a front receiver blocking the truck headlights. The best solution seems to me to be attaching a receiver to the rear of the RV, although it is not cheap if done properly. Decisions, decisions.
Bob