What's the OD difference in the mounted tire? Smaller would be better for towing. If they are the same OD based upon the profile of the tires then it would not matter. But I do agree that you need some LT's with a load range.
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2016 36FBTS Pinnacle
2016 F350, 6.7, 4x4, DRW, long bed
B & W Companion 5th wheel Hitch