A couple of years ago we went into "buy here pay here car sales." The first thing you learn is nobody buy's a used car unless they are getting fired and being kicked out of their home and are being disowned by their family all at the same time. You would think that would make them hard to find however that is not the case now. All we have to do is go to the computer type in a few commands and see where our car is parked and go bring it home. We do this with a little box that costs about $250.00. If we want to we can even turn the car off. It takes about 45 min to install. The only thing is for a trailer you would probably want a seperate battery