Hi Sam,
My 79 c20 has 16.5 wheels on it and I found out about the price/selection of tires too. @#$% that.
In '21 I found some fancy pants 16" wheels with studded snow rollers (tires are 20 years old but with minimal use and proper storage - look incredibly good) for cheap in the size 265/75/16, which translates to roughly 31 x 10.50 x 16 and is not a size that will crack yer huevos too hard. Mainly bought for the wheels, because have you priced wheels lately? That's another topic... 32 lug nuts @ $3 a pop... yikes! I'm not 100% sure but these wheels seem to have an appropriate offset and are 10" wide. I have yet to mount onto the truck because so far its in a gathering parts stage and being winter, well, you understand. I haven't looked at the truck since I found the battery stolen.
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This is a fun widget to play with when considering tire sizes.
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I like the products at Detroit Steel Wheel but I want to get on the road before getting too deep.
tps://tiresize.com/height-calculator/