A decade ago, I stored a 23' boat trailer at the Glendale site. In the fall when I took the boat out, I noticed someone took my nice trailer and swapped with with and old rusty one with the brakes and fenders removed, bald tires etc. The Gilford police tracked the VIN number and the trailer was stolen several years earlier on Cape Cod. There were no plates.
Since, I never got a call from the police if they ever recovered my trailer.
The real owner of the stolen trailer was notified and he never bothered to pick up the trailer. The last I knew, the police hauled it to the Meredith Marine Salvage yard.
My insurance company was very supportive, they gave me enough money for a new one!
Good luck in the recovery of your trailer!