I have been towing out G23 with a Toyota Sequoia. I also notice that NRyan has his G hooked to a Tundra. The driveline in the Sequoia/Tundra seems to be solid, plenty of power in the engine and trans combo. You won't win any off the line records but it does handle it well...gas mileage when towing - well, it just sucks which is pretty much expected. I have the Platinum edition with self leveling suspension which I feel is a must have with any SUV or pick up...at least in the 1/2 ton segment. With the shorter wheelbase, the trailer will tend to push it a little, especially on corners before the surge brakes activate which I why we are planning to upgrade to E/H brakes on the trailer. The new GMC Denalis with the 6.2 seem to be solid vehicles, good torque, good power, leveling suspension and are supposed to be mated with an 8 speed in the near future, which should provide better mileage. There are also a few articles out that show a GM SUV with a sticker under the hood referencing a diesel motor and rumors about the Sequoia being available with a diesel since the Tundra will be getting a diesel option for '15 or '16. If the Excursion is running solid, it may be worth waiting another year to see if any of the current diesel SUV rumors will be produced or confirmed.
Below is a link to one of the GM Diesel SUV articles
http://www.greencarreports.com/news/...uel-efficiency
Below is a link to one of the GM Diesel SUV articles
http://www.greencarreports.com/news/...uel-efficiency
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