backing camper into garage with a driveway incline...help!

An idea for out of the garage assuming it is too heavy to manhandle, might be to hook a chain to the truck and put the truck in neutral and let the slope of the driveway and the weight of the truck pull it out while using the winch to let out the cable at a controllable speed. I would recommend someone in the truck to put on the brakes if something would go wrong. Once out chalk the trailer and hook up normally.