Rangerman40 wrote:
I have this... weighs a ton
http://m.westechrigging.com/pewag-security-chain-932-kit-6.html
I use a 20' common 3 conductor electrical extension cord. The trick is that both ends are then plugged into a matching set of male and female sockets that are then connected to the house batteries, a NO and NC solenoid, a small alarm horn and a red strobe light that connect back to a small alarm box. The ground is a common negative and the two main conductors become the NO and NC circuits. It's all switched on or off from inside the coach.
No keys to remember, no heavy **** to lug around, no worries.
If the cord is unplugged or even a single wire is cut it trips the alarm.
Total cost was about $50.