A add-on for the almost blind old guy

You don’t want the Fastguns as tight as you can get them. You want them as tight ad they are supposed to be and no more. Too tight and you risk compromising the camper’s attachment points.

For the front: If you use something wide enough to spread the load a bit, loose blocks between the camper and bed wall should stop the movement. If they want to move in transit, attach some thin plastic sheeting to the bottoms and set the camper down on the plastic to hold them in place.