I'm no expert when it comes to galvanizing a truck frame but I am in the steel business and we have a large quantity of steel galvanized everyday. The steel is dipped into the molten zinc at a temperature over 850 degrees. If not handled properly there could be considerable warping. When we have fabricated frames or trusses there are special ways of dipping them.
Good luck. Typically galvanizing can cost anywhere from $.13 to $.25 per lb.
Brian
