Pulling Travel Trailer in Colorado with Tahoe

I've got almost the same set-up: '02 Yukon XL, same engine & rear, and a hybrid trailer. I haven't been over 8000' yet, mostly northern NM & AZ. It pulls fine but steeper grades will be done at very slow speeds.

You might be slow as you approach the I70 tunnel from either side. Let the vehicle downshift and have patience while climbing. Enjoy the view and don't make it a race and you will be fine. Keep control of your speed when descending too. Don't ride the brakes. Let it coast up to speed and then use the brakes moderately firm to lose 15-20 mph before you let off and start letting it gain speed again. Downshift at least one gear for the descent. Before you know it this fun part will all be behind you. Leave extra time so you are not rushed.

The weights and measures people will be asking you for more information. Your tow capacity is, standing alone, not worth much. However, I have some experience with that area, having lived there for many years. You might consider other routes to Colorado Springs. Of course it depends on where you are and very you are coming from. But you could go through Breckenridge, up over Hoosier pass which is not bad, and down through Alma and Fairplay, that being on Highway 9, and from Fairplay a couple minutes jaunt on I believe it is 285 over to Highway 24 and East to Colorado Springs. I'd tell you not to be scared off from the Eisenhower Tunnel and Vail Pass. But Figure on losing approximately 3% of your horsepower for every thousand foot gain in elevation. Don't try to keep up with fast traffic, just maintain a comfortable speed for your engine and transmission. Use gears on downgrades where necessary, keeping off the brakes as much as possible. That drive, particularly west of Glenwood Springs on I-70 is just gorgeous. One of the most beautifully yscenic highways in the country.