Al bit late to the party and fwiw...
I parked at SFO Long Term Parking Thursday, April 21-24
Booked an 8:30pm-8:30pm reservation in February for my travel dates and it was $36.00 all in
(it's less expensive the farther out you bok and you can cancel for free up to T-24 hours)
I ended up parking on the top (uncovered) floor as it was full* everywhere else in both buldings
Travel time from walking from my car to the Airtrain to the United Terminal (T3) was 20 minutes
(and the same for the reverse when I arrived)
My return flight was almost 3 hours late arriving at 10pm and I didn't get to the checkout gate until almost 10:30pm.
Not knowing how to handle the late arrival, I played dumb
and drove directly to the check out gate
Scanned the QR Code on my phone
Machine said to try again
Tried again and the gate opened
No addtional chagres hit my credit card