Two systems I installed:
1. Smarthome.com ( wireless )
Interior motion sensor with contacts on all windows and door. Has remote fob for turning on/off, added an additional exterior siren. It has a ton of features, even will dial your mobile phone when you have a hard line hookup. Reasonable cost, but takes two people to install, one to read directions by the step, one to push buttons.
2. Another smart little gadget from Smarthome. A little 8'x 6' box ( we put in the compartment under the vanity )that barks like a dog, even tho it sounds like he/she may have a cold. Using an X-10 Motion Sensor mounted outside next to the awning upright, it 'barks' if someone has approached the coach. Useful when you may be camping in a remote area, and would like to know if anybody is mill around outside.
Walt / Julie Darden
2004 Alpine 40FDTS