After many times fighting to get my camper in and out of our backyard, I decided this was the best way to go. I always had to find a neighbour or my wife to give a guiding hand to get it thru our 30' long garage to the backyard. The garage has a door at each end and the back one is a foot narrower. I only have about 3" on each side and if the camper got out of control, on the grade, it would be disaster on the side(s). To get it out from the back yard I was using a 12V winch attached to my SUV at the front door, as it was difficult to push it thru manually. On one attempt the tow strap did come apart at the hook end and this was an unused strap, poor quality. I didn't want to trade in my wife for a much stronger one.
This should solve my problem.