Finally checked out Automaxx of the Carolinas (Summerville, SC) after seeing their lot on my commute for months. They keep around 93 vehicles, mostly family SUVs and sedans. They were totally fine with my mechanic doing a once-over, which honestly settles half the trust question.
Lot address: 1016 N Main St, Summerville, SC 29483. Visitor parking: Front lot on N Main St. Website: https://www.843auto.com.
Paper side: licensed with the state (looked it up), about 73% of stock has title in hand per the office, and they offer no warranty — as-is, but any inspection welcome.
Overall: good people to deal with. 8 years in business around family SUVs and sedans, doc fee $399 and it's on the window sheet, no games. I'd send a family member there.