Pulling Travel Trailer in Colorado with Tahoe

I finished the trip. I made base camps at Golden Gate Canyon State Park Campground (Reverend's Ridge...beautiful fyi) and KOA Colorado Springs. I give the 2008 Tahoe a "C" for the trip. It definitely had the power, but transmission temps were the enemy. In Colorado, the max temp I saw was 221 on 2 occasions but max time above 220 was 3-4 minutes all trip. I hit 221 at the top of the Golden Gate Canyon Road and once simply driving from Golden Gate Canyon State Park to Colorado Springs. I had to pull over past Denver to allow some cool down. Colorado was unseasonably warm this summer when we were there. Outside temps 95 degrees and above and if I got a series of inclines with not enough declines or flat runs in between, it would continue to rise with that amount of outside heat in the air. Coming across Kansas it was really hot too and if I ran the a/c, the temps would go above 210. I got to 216 before I realized that if I cut the a/c, then the transmission temps would range mostly between 198-205. So, we went without a/c for much of the trip. If outside temps were 85 degrees and below though, my trans temps improved even further (upper 180s and 190s). I did add an aux trans cooler and I cannot imagine having taken the trip without it. It was a must have. While I did take a day trip to Glenwood Springs, I did it without the trailer and I am happy I was not towing after I saw what Vail Pass was about. The most difficult part of the trip for me though was dealing with the wind in Kansas. I ran mostly 60-65 mph vs. the speed limit of 75 mph as a result.