Simple pocket stake rail system to keep my frame up off the truck bed rails so I have access to the bed below even with the frame attached.
The height of the posts can be set by you to whatever you need when you make it... I only needed a little more space and I like keeping things below the roof line for aerodynamics... And ease in loading the frame by myself.
I will strap the frame down to the truck bed tiedowns and not just the wood rails.
My truck is a double cab so it has the full size 6.5' bed... I wouldn't recommend the short bed option... I pretty much fill my bed for each trip.