Looks like a good project. No major dings or dents obvious and every thing seems to be there, including the black lic plate. If you move the trailer out from under the tree it might clean up very easily. Logos can be photo'd and replicated. Unless there is major water damage inside this is more than a parts trailer.
It's been used as a shed for 33 years. If we had to replace it, an ugly Tough Shed it would cost $3000. Best left where it is so we can enjoy the patina.