Easy Peasy.

Dollar took away the rental agreement and refused to let me see it, aggressively upselling items I didn’t want, charging me over 400 additional dollars.

Great, convenient. It's actually at the airport and not far away. The car was fantastic and there were no additional charges :)

Overall pretty good. But it was dark and raining heavily when I picked up the car, so it was a bit rushed. The staff only asked if I wanted to buy the highway toll for 180 dollars, which I agreed to without carefully checking the receipt. The next day, I found out there was an extra 300 dollars for insurance. Careless! But later I thought, full insurance is not a bad idea. Still, Dollar should have asked. Also a reminder for renters to pay attention themselves.

We booked a Jeep Cherokee but ended up getting a Chevrolet. Other than that, everything else was great. When we extended the rental for another week, it only took a phone call to arrange it. My English is not very good and the call quality wasn't great, but the representative from Dollar Rental was extremely patient, speaking slowly and repeating themselves until we understood each other. Finally, they informed me that I didn't need to complete any formalities at the Pittsburgh airport, which made me really happy. I'll definitely choose Dollar again next time.

paid a fee for adding extra driver for part of the rental. Why does extra driver mean extra cost?

Rebooked a couple of times to get lower rates tat came along.