C20 tire sizes?

[White70C20]

Ok, I was looking at the tires on my C20 the today. They're almost bald and very weather checked. The tires are 270R16s. I put my junkyard spare that has a 280R16 up next to it. I like the look of the taller tire on my truck (it is a 3/4 ton after all). It does have the Custom Camper pkg. What tires did those come with. My truck looks like a 1/2 ton with those smaller tires on it. Since I need new tires anyway, I thought I'd put the factory size on.
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