I lived outside Grand Lake for a number of years. i-70 to Empire and over Berthoud Pass (Hwy 40) is the best option. Why 34 from Loveland through Estes Park/Rocky Mountain National park is a scenic route that is amazing, it is not the best option for towing an RV.
I70 is a pull out of Denver up to altitude, but it is a 3-4 lane interstate Hwy and allows for slower traffic. Berthod Pass is gonna be a pull but it is better than the altitude change you will experience on Hwy 34. Feel free to IM me if you need more info. Grand Lake is a beautiful area, lots to do if your into the outdoors.
Kb,Lori,Abby and Doberman Rosie and Boxer Boaz
Portland, OR
2004.5 Dodge 4x4 Cummins, 48RE, Firestone RideRite Air Bags
2016 Creekside 23DBS
Past -
2014 Komfort Trailblazer 2610BH
2005 Starcraft Hybrid