I've had no problems with the KO2 37x12.5x17 C rated tires I have. They aren't much heavier than the stock Goodyears (maybe 9 lbs) and they run small so closer to a 36. The spare fits without a bracket to lift the 3rd brake as well. If you go with aftermarket wheels, they will probably be lighter than the stock Sas wheels so you might even be within 4-6 lbs of stock with a C rated 37.
Edit: It looks like the stock Sas wheels are around 35-36 lbs and the ProComp wheels I have are around 24 lbs so the 9-10 lb increase in tire weight over the stock Goodyears is netted out by the 11-12 lbs of weight savings with the wheel. So in my situation there is no change in the wheel/tire weight vs stock Sas. A true 37 tire in D, E or F rating will probably weigh 8+ lbs or more.
Edit: It looks like the stock Sas wheels are around 35-36 lbs and the ProComp wheels I have are around 24 lbs so the 9-10 lb increase in tire weight over the stock Goodyears is netted out by the 11-12 lbs of weight savings with the wheel. So in my situation there is no change in the wheel/tire weight vs stock Sas. A true 37 tire in D, E or F rating will probably weigh 8+ lbs or more.
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