In answer
Hi, no alarm system is going to stop a pro taking your motor home if they want it. T1 alarm systems can be hacked by any pro with a lap top, But its very unlikely that these people target motor homes. What we face are yobs looking for sat navs, wallets, even pass ports these days and of course money. you can,t stop them getting in, all motor homes have weak stops ie plastic windows that anyone can open, At the moment my motor home is in france, to protect it I have a london wheel clamp, and all the curtains are open and the storage boxes open for view from the outside, it shows that there is nothing inside to take. On the move I have two dogs that come with us and that works.
Back to alarms, just ask yourself how many times have you heard alarms going off and seen people just walk away. They do not have the take notice factor they once had. As to fires all you need is a smoke detector.
terry