I tried all my cars and the values are really high.
A 2003 Toyota Sienna with 200,000 miles isn't worth $5,500 in Good condition. I mean I wish but no. Maybe $3,000 under crazy current market environments but probably more like $2,000-2,500.
Likewise a 2006 Toyota Corolla with 180,000 miles isn't worth $7,000.
But great job OP at trying this. It's a service that's really needed.
I would suggest figuring out a way to clean up the options for the trim levels. Some are just random garbage that describe part of the car - I had one trim option that was literally "1.8L" which refers to the engine. Along with 30 other options, many of which were repeats of each other.
I'll be the pedant to point out it can't move more than 100% on the downside. Which since it has risen more than 100% in less than a year seems like a decent deal although fraught with risk to be sure.