My 2000 Dakota Quad Cab weighs almost as much as a fullsize Ram and it tows great - a lot of low-end grunt. The 4.7L 2WD Dakota (with tailer package) towed my 22' Four Winns better (i.e. less gear hunting / downshifting) than the 5.7L 4WD Tahoe.
Unless it's dead flat (like most of SE MI) I do turn off the OD.
This is the Pub. Leave common sense at the door.