Split the difference.
It’s a bit of work for both sides and more risk for the buyer than seller that something goes wrong.
What happens if you reject the car?
What happens if buyer payment bounces? (My ACH went through 3 days after pickup)
What if repairs need to be done?
Lots can go wrong and seller just wants to take it all. Initial proposal says a lot.
I just did this this on a Model S.
There is advantages for buyers to wait. Less Model X QA ramp up issues and new headlights.