Need advise towing I-70 West going from Denver to Vail

Drive like I do! LOL Actually 45 down a 6% is good until you aer used to mountains. I was raised in the Rockies and learned to drive truck over the Old Levita Pass which was 13 %. Boy did our brakes smoke coming down with a load of Potatoes. Have fun, envoy the scenery and stop and watch BNSF trains climb the hills. Some use about 30800 horsepower and may go 10 MPH up.