The 1/2 ton running board length at the cab side is 63 1/2 (or 63 3/4) and on the outside is 83 tip to tip. Width at the front at the cab/front fender is 18 and 10 at the bed/rear fender.
There was a complete 41-46 3/4 ton pickup in Midlothian, Texas a few months ago. It's in pretty good condition. I need to get pictures and post it in the swap meet/spotting network.
1946 Chevy Half Ton ('56 235, '86 T5, '79 Camaro Z28 rear end, working on the '85 Jaguar XJ6 IFS)
1976 Margay Panther X, MC91B
