Your S10 certainly doesn't need LT tires, most full size half tons don't even call for LT tires, at least the years I'm familiar with. My 94 F150 4wd stock tire size is a P235/75/15XL. The XL is a slightly higher load rating than without the XL designation, but it's still a P tire, only 6-plies.
I would never put an LT tires on something as small as an S10, because if you're looking to carry that kind of weight you need something bigger, or you will be way overloaded.
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