Hi Jarm2,
I have a 2010 Traverse a and a Jayco 213. We've been towing for 5 years with this setup and the Traverse does a great job.
The only thing I added was an a transmission cooler. I know my Traverse with the tow package has some sort of extra cooling, but I wasn't happy with it.
I bought a Scangauge 2 to monitor my transmission temps. Prior to the external transmission cooler, I would see temps between 180-230 degrees. 180-210 was on the highway, 230 was only hit once, when we were doing grocery shopping and going in and out of driveways and traffic lights, and it was 90+ degrees out.
Now that I installed the cooler, my highway temps are 165-205. My last trip in October, we were towing home from Myrtle Beach, SC to Niagara Falls, Canada. We were in the Appalachian mountains and I merged onto the highway from getting gas and immediately ascended a 5 mile long hill in near Fancy Gap, VA. I ascended this hill at 55mph and the transmission hit 213 right at the bottom of the hill, when I was speeding up to get on the highway. The entire way up the high, the transmission temp didn't change.
We are really happy with how the Traverse tows. I'd love to get an F150 someday, but for now the Traverse will do.
We have probably 10,000 trouble free kilometers towing. We are going to Florida in March and we will be towing our trailer down there as well. I have worries about how it will handle my 213.