Front wheel off. Inside the tow vehicle or the teardrop. Out of site is the best method.
In addition, when I am out for a hike, bike ride, or other reason to be away I turn on my radio in the cabin just loud enough that someone walking up to the camper will notice. My theory is that this is a good deterrent to someone snooping around as they may think someone is taking a nap.
Edit
BTW, Friz is the "bike in a small space" Guru. After seeing his post (below) mine is a rookie move!
