I have the bed from my Gladiator project sitting, waiting to become the camp trailer.
I like your ideas, especially the hitch and suspension. Since I do most of my forum browsing on my old iPhone 1, I can't see details too well.
First question: how does that hitch deal with thrust forces? Are there bearings, or ?
Second, what's the scheme for mounting the airbags? Do you have a good source for bags and compressor and controls?
A thought just occurred...all you need to do is add rear steer to your rig and you'll be the busiest 'wheeler in the state!