[tgh117]

Don't cover it in stainless to keep the weather out. That will still let the rain and slop and salt behind it and it will just rust away behind it and you won't see it. Its tough to prevent the rust up here in the north. You just have to keep after it. Best thing to do is take a wire wheel and wheel all the rust out down to the bare metal. Then fill any possible issues you have, then primer it with a couple good coats, then you can paint it. As fas a a color, that I dont know. Maybe a dark blue or something? I don't have a tutone truck either, but the second color comes a good 5 or 6 inches up the door. One thing you will have to remember about just doing the bottom of the truck, is that you will have a line where the paint meets the old paint, that is typically covered up with an adhesive molding to hide the edge . Its not quite a realy simple process to just paint the bottom, probably more difficult then thought originally.

Good luck though!