I just came back recently from a 5,500+ mile road trip (wedding, Glacier National Park, several family home visits, friend visits, etc) in our Tesla Model X. I did I80 on the way out and I70 on the way back. (I90 is from the previous year)
I drove with AutoPilot for 95% of the trip. It was fantastic for the highway driving. Drove with hand(s) lightly on the wheel with much less cognitive work and allowed me to enjoy the scenery while staying refreshed/alert.
I used Tesla SuperChargers for all (~95% of miles) but northern MT (RV plug at a campground, siblings house welding plug, and siblings cabins electric dryer plug).
** This map includes the more northern route I've taken in the past in my previous X (top I90, mid I80, lower I70). Lot of options with the Tesla SuperCharger network. It also includes the counter-clockwise roadtrip I did in early July 2018 with an old friend.