I also have a Polestar 2 and I have an R1S. The Polestar 2 has been a great car but it doesn't even come close to comparing to the R1S. I can't think of a single way the Polestar 2 is better than the R1S. You won't be disappointed.
I do it solo, but I would not say it's easy. It's really easy with two people. Probably prohibitively difficult for a lot of people to do it solo without any type of aid.
The rack is designed to tilt down for easier loading/unloading of bikes. With it tilted down you can open the liftgate and the tailgate. The tailgate gets really close to a part of the rack that is involved in the lowering process when the tailgate is all the way down. But you can flip that...
That quote seems about right to me, there's probably some extra $ added in for unforeseen circumstances with the tandem breakers. You could ask if they would do it hourly instead?
Or you can watch a few YouTube videos and do it yourself. It took me about an hour to add a 50 amp outlet in our...