Free: Contests & Raffles.
I used a horse mat to get the camper overhang up above the truck cab. Seemed like the best solution. I have also used several 8' 4"x4" and plywood sheets to gain height.
I’m not familiar with the campers that you’re talking about, but I always thought they just sat on the floor of the bed. Overhanging the size, but not actually sitting on them.Ford does not publish anything like that.
Here's another option. You're almost there anyway.