On our trip out west last fall, we drove I-70 east from Denver to St. Louis. I don't remember anything particularly unusual or difficult about the route. It is pretty flat and boring thru Kansas and there is obviously more traffic near the larger cities. The volume of traffic around and thru Denver was the most dense but we had no problems.
2007 Country Coach Allure Siskiyou Summit, sold/traded Nov. 2018.
2019 Grand Designs 384GK-R 5th wheel. Glen Allen, VA