I have the 5er rails in my F350. We transferred a Lance 1130 from Michigan to Minnesota on top of a frame of treated 2x4s flat and toenailed with screw. The camper ended up slipping back about 8" from the bumping down the freeway. The tiedowns were vertical so they did allow the camper to slide and the wood was slightly damp from a rain. I stopped a couple of times to readjust and retighten the tiedowns.
I purchased a rubber livestock mat and will be using it next weekend but I also plan to remove the 5er rails and reinstall them when we use the 5er again. There is only 5 bolts for each rail so it wont be to bad for meI did not like the camper sliding.
