Adder, (important, please read):
When I stripped my M-1008 bed (circa 1986 MY) to paint for my monster truck (pics coming to my build thread soon) I noticed that there were a couple of the small panels on the front of the bed which were in fact galvanized. The big panel in front is not, nor are the bed sides. The two panels on the front that are galvanized, strangely, are welded to the bedside which, as mentioned before is not galvanized.
However, the large, single sheet that makes the bed floor, and the wheel wells are galvanized. Oddly, the cross members that are welded under the bed floor are not galvanized.