Motorhomes that are stored are the targets of thieves. We have never heard of a motorhome in use being broke into. We often see chairs, grilles and things like that left outside the MH and nobody botheres them. Locks will only keep honest people honest. Doesn't matter what kind of lock you put on it can be picked. As for burglar Alarms they would be almost useless and IMHO are not necessary. If anyone thinks a noisey burgular alarm would raise somebodys attention just stop and think how many times you have heard a car alarm going off in a parking lot. DID YOU INVESTIGATE?? Most likely it was dismissed as another noisey car alarm. What difference would it make on a motorhome.
IMHO things like tire pressure monitors, foam fire extinguishers, toad brakes, internet satelllite dishes, engine monitors, and other things to make RVing more safe and enjoyable rate a higher position on the want or must have list than a burglar alarm. ;D ;D
Burglar Alarms in a recreational vehicle would be a waste of money especially for a fulltimer.
Keys that fit bays on other rigs just isn't anything new. When I was a teenager I had a 51 Ford and a friend had a similar ford, maybe different year, but my keys for my ford fit his car and visa versa, even the ignition key. We discoverd this when his keys got locked in the car and my key opened his door. Not many locks or keys that are completely unique.