71 K10 should be 6 on 5.5" and they will be 15" rims so depending on lift and the suspension ride height that will determine the largest tire to use.
The 4X4 guys will be able to answer the size question better than I.
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The problem with America is stupidity. I'm not saying there should be a capital punishment for stupidity, but why don't we just take the safety labels off of everything and let the problem solve itself?
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