I strap a full sized 26" bike to the front of the sleep sofa. It is standing up, with the front wheel removed, and peddles positioned so they are not crushing anything. Cinch the strap around the Bike and front of the sofa frame and pull it tight. Bike does not move. Actually have siamesed two bikes together in the fashion. Works for short trips within a days drive. For multiple day travels, I leave them strapped. But don't use the couch. Its a bit of a pain to be unstrapping them every day. So the kids can use the couch.
