I tow a 6,000# (Wet) Travel Trailer with a 2009 Adrenalin. V8 AWD. 6,900# Rating (7K with 2WD) Tows great. I previously had a 2001 with the V6. I towed a ski/bass boat and a popup camper. Both great vehicles, but the V6 models come with the 5R55E 5 Speed automatic which is a bit of a turd. The transmission works well, but is prone to failure of the solenoids, and many shops just rebuild it. The V8 has the ZF designed 6 Speed which is a much better unit.
This photo was taken prior to setting up the hitch properly, and replacing the rear springs/shocks with Ranchos and going to a taller sidewall tire. This setup tows like a dream.
Both trucks got about 13-14 MPG, and towing the big trailer, closer to 10.

2010 Skyline Nomad. Heavily modified. 400W solar. Honda EV4010.
2009 Sport Trac Adrenalin AWD V8.
Next TT Project: Alde Hydronic Heat.