How long can a DA (TN) hold a vehicle after the original charges of theft were dropped?

My fiancee & myself were under the impression we were borrowing a trailer to tow a few cars home, ours wasn’t working at the time. Later we had been notified it was stolen. When I say notified I mean we were both arrested. We bonded out, received a court date & started to track down the owner of the trailer. We talk to the owner, explained our part, returned all of his property (with no damages) & he drops the charges. The DA steps in & says the truck could be apart of another crime, which is false. This is a small town & we borrowed the wrong guys trailer. It’s different in small towns, they try to create their own rules & ways of running things. Anyways, the “possible crime” the DA speaks of is the car that was on the trailer the night we had borrowed it, that it could be stolen. It’s my corvette, its in my name & has been for 5 years now. He ignores what I tell the court & they kind of laugh at me for not understanding what was going on & the DA seizes my truck for another 30 days