With my motorhome I don't know if I have a boat behind me or not, even the winner. It's a 440 V8 (8 MPG).
With the old Jeep I towed the Classic Barracuda back from California through Donner Pass, in a blizzard. and Okie-Dokie back from OK at 70+ MPH V8 (16 MPG) Both times I was glad I had the HP and 4 wheel Drive.
With the Dakota I drop out of O/D going up the Burnsville hill on 35W 3,3 V6 (24 MPG) I think it would make it through Donner Pas OK, but it would be working hard.
i haven't towed any distance with the Bravada yet, but it's a 4.something V6 and 5 speed 4 wheel drive, and I think it gets around 30 MPG, and will be a great tow vehicle,
The 4 cyl cars I have owned and the 48 Plymouth towed things, but I get passed a lot. I'm sure the turbo makes all the difference and will work fine, just don't go to Sacramento in December.