16" drop-center wheels for tubeless tires won't fit over the brake drums in the back. The standard wheel for that truck is an 18" tube-type, or a 19.5" tubeless. I had a 59 1-ton 3800 for several years, and researched just about every wheel/tire option possible. A lot of step-van type bread trucks were built on the 3800 chassis, and came with the 19.5's, so check with the bakeries in your area to see if they have spare tire/rim combinations they would sell or donate to you.
Jerry


"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!