I had a guy tell me years ago that there is not a security device ever developed that a thief cannot get around. What a device does is to make your vehicle less desirable to break into than another one. What you really want to do is to stop someone from even wanting or trying to break in as the damage that is done is a pain to deal with.
Having a camper on the back does a little to make a thief think twice as he does not know if anyone is back there.
One of the best and cheapest things is a flashing red light on the dash as a thief thinks there is a alarm and without a brand name / type is makes them think twice.
The club is also something that causes one to stop if they are thinking of stealing the unit as it takes time, maybe not a lot but enough.
A kill switch is also another smart idea, does not have to be much just enough to slow them down (just make it so you can activate it without popping the hood as people do watch). I tell this a lot about my dad's VW van. A group was in the area and had stole a car and were driving down my dad's street when they saw his VW van. They decided to steal it, left the stolen car and took my dad's van. They pushed it down the street before starting it. Only problem was it was a diesel and they had no clue about glow plugs so while trying to start it they did not let the glow plugs warm up so never got it started. Not only did they leave the stolen car but they found my dad's van down the street.
A simple thing is to clean up the cab of the truck and don't leave devices OR cords in the open. There may not be a device in view but three power cords mean that there was or is something.
A sticker on the vehicle or the camper can help as well. Something like protected by Smith and Weston can make someone think twice, or beware of the dog.
There are home security units that you can put in the camper and in the cab that will run off of 12V and will sound a siren or call a cell phone. A couple motion detectors inside will cover the entire unit.
Finally if you can park in a high visibility area and preferably in a monitored space. Not a 100% guarantee but an extra help.
