George,
Over the last 20 years, I have tried numerous ways to carry bicycles with the coach, and believe me, there is no perfect solution. Foldable bikes, usually with 20 inch or smaller wheels, do not even compare with a well built full size bike. Foldable bikes are not as stable or as easy to ride as a full size bike, and they take up a lot of very valuable basement space, especially if you are a fulltimer. Bike racks on the roof of the toad are hard to load, and the increased wind resistance will make a significant reduction in fuel economy for your toad as well as having to worry about the height issues when driving the toad (no McDonalds drive thru access). That puts us down to hitch mounted bike racks, or your idea of carrying them in the bed of the truck. Hitch mounted racks on the back of the coach are way to much in the way for me, so that leaves us to a rack on the back of the toad that is still troublesome or in the back of the truck taking up a lot of protentional cargo area. It boils down to what are you willing to tolerate to have access to your bikes.
Gerald