Looking to purchase a new Ram 1500 4x4 5.7 V8 Hemi. Max tow rating for the 3.21 rear axle is 8,150 and for the 3.92 is 11,250. Was wondering if the 3.21 is enough to tow an Elite II? From what I have read the 3.21 has better fuel mileage. The 3.21 would have 20” wheels and the 3.92 would have 22”.