Ok here is what I did after loosing my trailer. 1 electric jack that has a hidden switch. 2 toung lock. 3 audible alarm system that uses a tilt senser not vibration ( to many falses ). Doors are wired to alarm. Relay locks trailer brakes when alarm go's off. 4 satellite tracking system that pages my cell phone when alarm go"s off. The reason for the extra security is we can not replae the lost time that we spend building . I can talk you through setting up of the system if you need. Dan Avilla