locomech,
We drove between Colorado Springs KOA and Cedar City, UT, in 2014 with a few stops in between. Our trailer is a Premier 22RBPR and the tow vehicle is a Toyota Tundra with tow package and the 5.7 liter engine. The uphill grade to the Eisenhower Tunnel was a non-issue, as the truck was easily up to the task. The downgrades were a concern since we had not driven downhill for these distances before. That being said, all went well, just watch your downhill speeds.
We used the "Next Exit" book to locate RV-friendly gas stations. For most of the stretch, there was nothing that fit the bill. At Vail Pass, we topped off the gas tank at a roadside rest using our 5 gallon gas cans that we brought on the trip. If we had taken the time to occasionally exit the interstate to find an RV-friendly gas station, we may have found something that would have worked out for us.
There should be no tunnel or road issues of concern. In fact, the view is fascinating for two people who grew up in the east. Don't forget to take pictures/videos as you descend from the mountains.
Once on I-15, watch your speed. As I remember, the speed limit is 85 mph. It seemed too easy to go too fast for the camper tires.
Enjoy the trip!
Craig
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