Goodtimes and I built a rack system that clamped onto the bed rails using the stake pockets. It worked really well. I have no need for it anymore since we have the FWC for the Dodge now. If you were closer I would say that you could borrow them for your trip or make me an offer on them to keep for your truck.
I'll find some pictures in a bit so you can at least maybe get some ideas.
1984 Jeep $crambler - Lifted/Locked on 35s/Caged/RTT Rack/Etc...
(The neverending project... )
2004 Dodge Ram Quad Cab 4x4 6spd Diesel - Gauges/Rolltop Bed Cover/RTT Rack/Lorenz Bilstein 5100 Suspension with DP Leaf Springs
2002 Hawk Four Wheel Camper
"Paved Roads... Another example of wasteful government spending."