I have driven long distances and have the following pieces of experience....
1) Pre-plan your trip and make multiple large maps of each section of the trip. (I will explain below). You MUST plan your drive TO YOUR SELECTED CHARGER, not look for a charger when you are near empty.
2) The mile to empty gauge is worthless. Put tape over it. You should estimate your miles left by charging to 100% and estimate that each % of battery is the number of miles left before ZERO.
3) you should never go to ZERO, ever. (20-30% is a good low end). I would estimate that you stop to charge every 40-50 miles (get a charge when your battery is between 40-50%). Doing this is better for your battery, and if there are any problems that the charger does not work, you still have enough battery to get to an alternate charger.
4) Unless you use a QC (really fast) charger, you do not need to let the battery go all the way down. Letting the battery go down only increases the amount of time you need to wait at that charger. If there is nothing to do there, then you spend a lot of down time waiting. I would rather wait 1-1 /2 hours in 2 places than 3-4 hours in one place. (unless you find a place that has dinner and a movie! nearby).
5) Use the Chargepoint website/app on your computer or phone to find good places along your trip, and WRITE THEIR LOCATION ON THE LARGE MAPS YOU MADE IN STEP 1. (address and name of the place). You need to sign up to Chargepoint to get an electric card that will let you use the chargers. It is usually free to charge, but you will need to give a credit card number in case that some chargers have a fee.
6) I have found that more reliable chargers than chargepoint is to search for all the dealers ( Nissan, VW, Ford, and Chevy dealers) you can find, and put them on your map (address and tel Number). Call up the dealers (service department) before you travel. Ask, "where is your outdoor parking lot electric car charging station?". If they ask why, only say " I want to know where it is if I need it". (Some dealers only want the chargers for THEIR customers.). ALWAYS ASK IF THEY HAVE A CHADEMO (fast) charger or level 2 (j1772 plug). The best time to travel to the dealers is during business hours... Then you can blend in with the people waiting for their cars to be fixed, watch their TV, and have free coffee, bagels, and WIFI for y our Ipad movies...
7) only do this trip if you can really get into traveling to enjoy the stops and adventures of new, unknown places where you charge. If you see it as a chore to wait for the car to charge, you will not be happy.
I hope you enjoy your trip.... I love doing this, just as much as I love going camping or taking a bicycle trip.... Going really far with very little... AND THE FUEL FOR THE TRIP IS ALL FREE!!