During our recent long hauls I used RandMcNally's trip planner for some initial ideas along side Google Maps.
Rand McNally allowed me to add in stops and had some neat fuel planning
Rand McNally - TripMaker
Google Maps however offered alternative routes on an initial search. It also allows you to drag around your route to make changes. Pretty portable onto your cell or tablet. Once I had a general direction, I set in guestimations for stop locations so I could estimate some evening stops.
https://www.google.com/maps/dir/Las+...8!2d43.1706128
Looks like your route goes through Colorado and through the Eisenhower. I-70 is an amazing drive if you have never done it before. I suggest a bit of RR before you cross the pass. Perhaps Heaton Bay Campground in Frisco.