I am sure most of these coaches, mine included, have an alarm system. We also utilize the electric locks on the bays but we are always prepared to go on offense.
While I seriously doubt someone would try to enter the coach while we are there, our coach doesn't sit out at night without us in it. The exceptionn is when it sits in front of our house the day before we leave. But our neighborhood is patrolled and the most significant crime is door to door sales.
So our coach has the standard motion detection and pressure sensors in the floor, so someone getting in would be startled and the dead would arise.
Then there is always the 9mm Sig (and before all you 45 cal guys get cranked up, if you can put 8 rounds in the X ring, a 22 will work) and we have a Winchester 1300 Defender shotgun with 4x00 that will open a hole in the coach if need be.