I just completed a 5,303 Mile Coast to Coast Road trip (CA to GA and back) with some side excursions to do some amateur photography all using 100% Superchargers (No L2 charging) with my 2018 Model 3. I was a little nervous starting out with the typical fears (will I have to wait in line for chargers?, will there be any gaps in coverage?, what do I do if a charger location is offline?) but got over all that very quickly. Overall the trip was awesome! I thought having to stop to charge every few hours would get old but once I got into the rhythm I actually enjoyed it.
1] Discovery - There is a "Tesla Void" between El Paso, TX and Mississippi - I saw like 2 other Teslas the entire stretch out and back, lol....where is everyone hiding?
2] Used EAP > 85% of the time. I had 2 instances of having to take over. Both involving Traffic Cones and merging construction traffic. Tesla: Why are these invisible to my EAP? Other than those instances EAP was nice and I was glad to have it.
3] The "Flaggstaff, AZ" location (Way to Hard to find), and the "Birmingham, AL" (have to pay to park to charge unless you validate parking at nearby store) were my *least* favorite chargers. The "Buford, GA" (the local Tesla owners who use the chargers keep a window squeegee and window cleaner available at the site for drivers to use) and the "El Centro, CA" (Near a big mall with a Mexican restaurant nearby that serves good margarita's) were my *most* favorite charger sites.
4] The in car NAV charger status was nearly always wrong. On nearly every location it showed 2 chargers occupied. When I arrived and connected it would then show 3 in use but I would be the only person there. This makes them conservative for planning purposes...so ok... I guess.
5] Tip: plan the entire trip with a EV Planner app, then execute real-time using the in car map routing. (I long for the day we will get the ability to add multiple way-points and do complex route planning in the car).
I did a youtube video which talks about how I did the planning, route I took, car I used, video clips of the charger locations, and some photos I took of some of the "excursions" I did along the way. May be helpful for others planning similar trips. It's a bit long but some folks may find it useful. Enjoy: