Rule of thumb is 3% loss of power per 1000 ft. of elevation gained. You're going to gain about 9100 ft., so you'll be down about 27% on power from your home elevation.
It looks like the last 4800 ft. climb is in the 21 miles from Boulder to the campground, an average of 4.3% grade.
Just slow down and watch your brake, coolant and transmission temperatures. My Ecoboost has no trouble producing power in Colorado, but the under hood temps can start to climb. When I drove down from Pikes Peak, not towing, the ranger checked the brake temps and made me and most of the other drivers pull over and let the brakes cool off. I bought an infrared thermometer to take out there next time to just stop and check the brake temps occasionally. I don't tow the camper out there, just an enclosed trailer full of dirt bikes, 9200 lbs. GCVW.
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