I'm a long time truck camper, and am now considering adding a fifth wheel to the mix. I was thinking toy hauler, but only because my wife and I each have bicycles. I know a toy hauler might be overk...
Some bunkhouse models of fifth wheels and travel trailers have bike doors and fold up bunks. So you can load the bikes right inside. That is the kind of TT that I have. So we put the bunks up and load the bikes inside. When we get to our destination take the bikes out and put the bunks down (if the bunks are needed - if not we can use the space for storage). Here is one example, there are many different brands and sizes with the same basic principle. Clicky