Here is wishing you the best Summer ever! You might try taking a trip to a local dump station without having any product other than water in the tanks (
My first dump station trip) but other than that you should be set.
Since Longmont is already at 5000 feet you may be near acclimated already, just avoid stress the first two or three days BUT unhitch soonest so you can dive (drive) down to lower altitude for a good meal (of Oxygen?) in town if anyone starts to get the wobbles, I know that's helped me all three times I played with being over 10,000 feet elevation for more than a drive-through...