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I'm going to make a guess but as machining isn't exactly perfect your rear end may have had issues in its build. My 02 although new to me has hauled a 7500 lb camper from VT to WV several times and has towed many cars and trucks on full car haulers from U-Haul with no worries does tend to hurt your wallet towing when you hit the pumps twice as often, but thats just the game take your truck add another vehicle plus trailer and you have the weight of 2 plus tundras to pay for in mileage LOL
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