While I haven't been out west with my e-tron, try the Electrify America website map first. It looks like they have chargers every 100 or so miles on the 15 to LA. And have a backup plan incase the EA chargers are not working, using chargepoint, EVgo or other charging stations. All the EA charging stations along the way each have 8 charging stations, so hopefully at least one of them should be in working order And make sure you MyAudi app is working ti enable EA charging from it. A few weeks ago I couldn't get the app to work and I had to use a credit card to get a charge (and the chip reader didn't work for me - has to swipe the card to get it to work).