I made a nice oak box with a cedar lid, then wrapped the lid in roofing coper and soldered the seams. Haven't used it in the back of the truck much though. Originally I built it to hold chains and binders and stuff, but it turned out to nice and I use it as a tool box now.

For the back of the truck I use a 2'x2'x4' steel "job box" bought it at northern tool. It is not water tight when driving down the road, but might be with some weatherstrip around the lid. I did drill some small holes to let it drain, and set important stuff on top of something else.
I also picked up a steel box the same size that is riveted together, looks military surplus from the 20's, but I have no history on it. It'll look just right in the back of my truck.

I can take some pictures of boxes if you would like?

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-