My after market 16" rims work just fine with 235/85/16 tires on my 3/4T. Here's the info from a previous post.
16" rims which work on my \'48 3/4T


1948 3/4-Ton 5-Window Flatbed Chevrolet

34 Years. Now with a '61 261, 848 head, Rochester Monojet carb, SM420 4-speed, 4.10 rear, dual reservoir MC, Bendix up front, 235/85R16 tires, 12-volt w/alternator, electric wipers and a modern radio in the glove box.