Well, I've owned my Tesla for 2 years and still have to drive 1000 miles out of my way to go east!
It is very annoying that I can not leave my city unless I head west.
It does get old to see a Supercharger go up every 5 miles in California.
I see, to go for example from Tuscon, AZ to Austin, TX you have to go to the north toward Alburquerque, NM
Instead of going east, passing by El Paso, TX. Big detour!!!
So, Tuscon, AZ to the SpC in Albulquerque, NM is about 440 miles.
And Tuscon, AZ to SpC in Van Hornes, TX is also about 440 miles.
Only option is going north to SpC in Holbrook, AZ about 240 miles, seems possible with your P85+ 265-mi (EPA)
Better would get a new SpC in Las Cruces, NM about 275 miles, but might be challenging for a P85+ unless driving slow.
Really need a new SpC near the states line, like Denimg, NM about 215 miles from Tuscon, AZ
And then Denimg, NM to Van Hornes is 220 miles. Could works going east even with a 60D, if not using AC...