Can I pull a 21' superlight toyhauler with my 1500? Maybe 7,000-8,00 lbs. Its a 2WD with a 5.3L. Lifted with 33" tires but everything else is bone stock. Pretty sure the tranny will go since it has 190,000 on it. Can you rebuild these trannys and beef them up for towing? Also the rear end has stock gearing, what can I do to make it tow better?