Keep in mind that most 3.7L V6 trucks with RWD/2WD came from the factory with 8.8" rear ends and not 9.75", so you may want to check if you still want to order these gears. As for jumping up to 4.11s from 3.73s for towing, the more aggressive gearing would help, however, if your truck isn't already tuned, you may want to pursue a custom tune before gearing. Tuning is generally a more cost-effective upgrade, especially if your truck already has 3.73s. While 4.11s can help, you would likely also need a master install kit and then installation, which gets pricey in a hurry. Also the jump up to 4.11s isn't that drastic from 3.73s, so it's tough to say how much you'd actually benefit.