Howdy. I have an 02 Ford F-250 short bed extra cab with cab high Lear camper shell. I need to build a platform that will support about 400 lbs, but only when the vehicle isn't moving. I am a professional photographer and would like to be able to take pictures off the roof of the truck. I already have a 2 bar Yakima setup but am not sure it will take the weight, so I was thinking about using an "over the camper shell" ladder rack that mounts on the rails, then build some sort of platform on top of that. Anybody do this to their truck? I'd love to see some pictures if they were available. Any recommendations about brand names? I live on the coast, so aluminum might be preferable from a corrosion standpoint. Thanks a bunch. I love that truck.