[skyking]

OK, calling fellow truck owners. I need the bed rail height numbers for your trucks.
I can get some online but if you could just take a tape to the highest point on your bed top I'd appreciate it, along with model and year. If you have a short box, give me the centerline of axle to back of cab as well.
I could make this trailer for my custom bed height, but if I wanted to make many of these I'd be better off if my prototype fit current pick truck beds.
Now I'm thinking I should make it to fit the 6'4" short bed trucks without a slider hitch!

I can do that by reducing the width up front a little more. Even if I taper it to 72" outside, it would still be bigger than a queen sized bed up there. With the proposed ~1200LB hitch weight it would be an easy half ton truck trailer.

My prices for Corning closed cell foam, from Allied Building supply:
all prices are 4' x8' sheets
25 PSI square edge(1.5lb/cu.ft):
1" 18.85
1.5" 28.15
2" 37.60
60 PSI Hi Load(2.2lb/cu.ft)
2" 76.00

100 PSI Hi Load(3.0lb/cu.ft.)
2" 82.25

Specs are here.
http://building.dow.com/na/en/produc.../rigidfoam.htm
I plan on getting a hi load 100 PSI sheet and making a floor sandwich with 3/8" marine ply on both sides.
I'd test it for flexural strength to see how far I can span with it.