Zen - Not sure if plugshare maps are exportable. I typically retype them into google maps.
dukecola - I always put the charging locations into google maps and use that for directions. They have an "avoid highways" option that I've used with success.
mrwilson - LOL! Yes, I try to "tag" every location where I charge just for fun, but also so people can see the charging setup.
I definitely add any RV Park I visit to Plugshare and try to describe how EV friendly (or not) they are. On rare occasions I have charged at local parks without permission (nobody to give money to, though I left money in the drop box). Mostly I call ahead and confirm there are 50-amp spots available.
There should be enough, or almost enough, places to charge along I-70 if you filter J1772 and NEMA 14-50 outlets on plugshare. It's always dicey asking to charge at a hotel that is for guests only, but I've had pretty good success especially in the middle of nowhere like Kansas.
I was only on I-70 through Kansas going west from Colby.
Using RV Parky, I always filter out stores, rest stops & gas stations because they will show up with the 50-amp filter, but if you click on them they do not show a 50-amp hookup. There are some Cracker Barrels in the Southeast that have J1772 plugs, but I haven't seen any with NEMA 14-50s.
Are you headed to Colorado Springs, Denver or somewhere else?