Spacing required to mount Alaskan camper in bed of newer Ford pickups

[NaturalSight]

Does anyone know how much spacing under an Alaskan camper is required in bed of the newer Fords to clear the walls of the bed? Also I am wondering what if any use could be made of this space?

 

[popRoid]

I presume you are talking about what support is needed in the truck bed under the camper to clear the bed rails ?

Attached find a picture of how I do it....the longer sticks were initially used to see if I needed more material to clear the bed rails...once I established that I just rely on the shorter 2x4's with 1/2 inch plywood caps running across the bed and pulled the longer sticks out completely before loading the camper. If you have a 10' cabover you will need additional support under the camper door and on top of the opened tailgate.

My 2017 F350 is the newer truck design from Ford with an aluminum bed.