07-09 (and some people reported on the 2010) having multiple;
1. Transmission wave plate failures. Causes loss of gears 1-3-5-R.
2. Timing chain premature wear. Check engine light, then grows from there.
We have a 2012 Enclave (AWD, 7-passenger, tow package). It has the DI engine. Absolutely love it except the 19" wheels (tires are expensive and limited). We've just passed 50k on it and not one complaint.
The Buick is rated to tow less than the Traverse/Acadia cousins because of the different suspension, but share identical drivetrain.
Tow/Haul mode on the transmission does just like all other T/H equipped vehicles, and it does work well. You can also lock out gears as you wish when placed in 'manual' mode, only being able to lock out top gears (allowing 1-5, 1-4, 1-3 ect, and locking it in 1st if you wish).
I've towed with ours, but not heavy 2000-2500 lbs, and it did great. On the interstate running 70 it pulled the flats in 6th, hills were 5th, and steep hills 4%+ were in 4th. When empty it will pull most hills in 5th. Any receiver hitch slop his kinda loud inside the cabin. There are guys on the Traverse & Acadia forums pulling normal mid 20' trailers and happy with results.
With the 3rd row seats popped up the storage is very limited. With them down there is a ton of room.
Wife gets 20mpg on here 70hwy/30city driving. Get 23-24 on the highway. Really flogging it on speed brought it back to 21-22.
For a TT, the similar sized Tahoe would be the way to go. A popup, or short/light TT the Lambda would do the job. Remember it is more of a car based vehicle.
