We put the boys bikes leaning up against the bunks in the bunk house with towels placed so they don't scratch anything. The bike with training wheels goes on the couch on top of the cheap queen blanket that came with the camper. The two adult bikes go wedged between the couch and the kitchen counters with strategically placed towels to keep them from moving. The tag along bike goes on top of the master bed with the dog crate.
Honestly, it's a mess of bikes and blankets and makes it difficult to even get to a snack when necessary. It's a PITA when it's been raining and if the tires are muddy, it's even more of a mess.
We are considering getting a rack mounted to the frame of the camper, but it will cost at least $400 for the welding alone. So for now, we deal with the mess and inconvenience.
