Long thread, and I didn't read all. I was wondering about the stretch from Flagstaff, AZ to Cortez, CO? Since 1980, when I wanted to drive from Phoenix to Colorado, I'd do it by the shortest route, especially on a motorcycle. That was a simple route, 425 miles long. Phx to Flag, Flag to Tuba City/Kayenta and 4 corners, then into Cortez on the last stretch inside Colorado. It is 260 miles from Flagstaff to Cortez, and the natural place to have a supercharger would be in the middle, at Kayenta. That is the gateway to the famous Monument Valley rocks. On my motorcycles, which have had similar ranges to Tesla cars, I would stop for gas in Flagstaff, then again in Kayenta.
But we have a local political issue here, and a good one. The bulk of the drive is through the huge Navajo nation, and from what I gather, they are against putting in superchargers for people to drive through the reservation when much of the reservation has no electricity at all. I can't say I blame them as they always seem to be second in line for infrastructure improvements.
For now there are destination chargers in Tuba City at the Moenkapi hotel and over the Utah state line at Gouldings hotel.
Getting to 4 Corners is a challenge from the south. And it sure seems like southwest Colorado is almost as bad as northwest Arizona. In planning my trips from Phoenix through Colorado I'm seeing a lot of restrictions on routes.