Hm.... I've not even tried a SuC yet, but when I back in, I *always* go until the bottom of frame is where I want the back of the car to be. That's the indicator on my X, at least. I do believe the SuC's are made so you can back up all the way until the tires touch the 'stops' on purpose. If they don't have stops that's a weird configuration. Most do that I've seen.
I hear you.... my old BMW had a pretty trashed front 'air dam' as it would scrape on everything. The X is a joy to drive, since (1) you can see where you are backing in, and (2) it has the ground clearance!
Yes. this is typical. Usually there are low black and yellow tire stops. These are low enough to clear the body and let you know how far to back up. Do I trust them explicitly? No. Summon is your friend. Get back to a distance that makes you comfortable, then get out and use Summon to back up while watching the clearance. You have to get out and go back there anyway to plug in, so why not?
Most of the ones I frequently use through Oregon, Idaho and Utah don't have the parking stops, but the one in Boise does. I've used it a couple of times, and I find that they put them very far out from the Supercharger stall. Even with backing up to where your tires touch the parking stops, if you're centered between the lane lines, the Supercharger cable is really tight. You kind of need to intentionally hug the driver's side edge of the parking space for the cable to reach comfortably. I think that's farther out than they need to be.
With Summon, you can move straight forward or straight back from outside the car using the keyfob or the mobile app. I don't use the phone because that is more links in the communication chain to go bad -- phone to cell service to internet to Tesla server to internet to cell service to car. With the fob, just press and hold the roof of the fob until the flashers go, then the front or back of the fob to move forward or backward. Any press on the fob stops the car.
