That's not how road-tripping works. You never charge to 100% because of how batteries charge. If you have a cell phone with any sort of fast charging technology you know this. Charging from 0-60% is always fastest, 60-90% is slower, and getting from 90% to topped off is slowest.
How does this apply to Teslas and the Supercharger network? Simple. The Superchargers are strategically placed much closer together than 0% to 100%. What you do is, start your trip at 100%. Drive until you're around 15-20%. Hit the Supercharger, and charge for about 20-30 minutes. That gets you maybe 50-60% charge. Then get back on the freeway and drive to the next Supercharger, and repeat. You'll drive about 3-4 hours each leg, and charge about 20-30 minutes. Your goal is to always be in the "sweet spot" where the battery charges the fastest.
Most people can't stand to be in a car for 12 straight hours. They want to get out and pee, stretch a little, have something to eat. If you're like this, road-tripping in a Tesla will work fine for you. You were going to stop anyways, but now you charge your car while you're doing it. If you're one of those people who literally sits in your car 12 hours and drives straight to your destination, then a Tesla will not work for your road-tripping method and you shouldn't buy one.