Well, I can tell you one thing: you have picked a great place to start! Cheyenne Mountain is one of our favorite spots, and you are fortunate to have a reservation there.
Can't help much related to I-70. We have stayed in our RV all over Colorado, but only once I can remember along I-70. That was at a campground called "River Dance." -- East of Glenwood Springs. That was because we were on a long trip back to Colorado from the west and we really needed to break our trip around that point.
Where we HAVE stayed: Estes Park, Buena Vista, Gunnison, Creede, Durango, Cortez, and, of course, Colorado Springs, just to name a few.
