agesilaus wrote:
How heavy is your TT and do you have the towing package on the truck. Either the southern or northern route is going to run over some high passes. Wolf Creek Pass in the south or I think Eisenhower tunnel in the north. I believe Eisenhower tunnel has a notoriously long grade and is used by truck reviewers to test trucks. But being on an interstate the grades are limited to 7%.
We never had a problem with either even when we had a F-150 5.4L or a Suburban before that. Most of these passes are around 11,000 ft as are a lot of other Colorado passes.
List of Mountain Passes in Colorado
Face this fact, you will be climbing mountains once you enter Colorado past the front range.
Oh yes something just occurred to me, the pass in RMNP is 14,000 ft to go from the east to the west side and I don't think they allow you to tow trailers over it. You should check before you make plans.
The highest roadway point in RMNP is just a shade over 12000 feet near Fall River Pass, close to the Alpine Visitor's Center. Iceberg Pass is just under 12000 feet, and Milner Pass at the Continental Divide sign on the west side, is at 10800 feet. There are no restrictions for towing trailers over Trail Ridge Rd, and indeed folks do it, as well as the very large tour buses. Commercial vehicles are not allowed on Trail Ridge, with the exception of delivery trucks taking product/merchandise to the Alpine Visitor's Center.
You may be thinking of Mount Evans Road outside Idaho Springs, which I believe has a restriction on trailers/motor homes above Summit Lake, and is at 14000 feet. It, and Pikes Peak Rd are the only roadways in the continental USA that reach 14000 feet. Longs Peak in RMNP is the only 14er in the park, and is the northernmost 14er in the continental USA.