[Motor31]

If you are thinking about something like an alarm similar to what is used on cars you will not be thought well of in a park. They are overly sensitive and tend to go off from wind shaking the rig. That's not real fun to listen to repeated alarms in a park when someone with an alarm has gone off on a day trip.

Your best bet is to change the locks on the access panels so that anyone with the standard key can't unlock them. Same for the door and always use your deadbolt lock.

If you are storing the rig the alarm system will drain the battery. Unless the storage lot is monitored all the time the alarm will be ignored. Some jurisdictions have a false alarm statute that will charge the owner for responses to multiple false alarms.