First, a correction to my earlier post. My best EDD was 9/2-22.
Once you have a Tesla you will only need it to calculate and plan a long road trip. It will do all the planning for you based on your driving style (read speed, ac usage, etc.) and will provide the time (when and for how long) and location of your next charge.
However, if you want to play around with it before you get your Tesla I would suggest the A Better Route Planner (ABRP) app. It allows you to choose the Tesla you own and to fine tune your driving and the enviornmental conditions for your proposed road trip.
As PatrickTM points out, currently the focus is on range because that's what the uninitiated hone in on. With most EV's suitable for a road trip you will be ready for a stop about the time the car needs a charge if not sooner. If your average speed is 50MPH (hard to do long term) you're talking about 5 hours for 250 mile range. Either my bladder or my back or both will be screaming at me by that time!
Which gets us to the point of why you are buying a Tesla...because of the Supercharger network. What every EV buyer should be focusing on is how quickly can you charge back up. That brings you right back to the V3 Supercharger's that Tesla has. Honestly, if you are planning to use your EV for long road trips or charging away from your home then Tesla is the only one you should be looking at. Maybe someday the other charging networks and EV makers will catch up, but I truly believe that will only happen when they can tap into the Tesla Supercharger network.
Tom