That's a nice trailer, and if you know its history, that's a plus. Tandem, already built sides, slide out ramp, looks like LED lighting. Can't see if it has spring or torsion axles.
It's more than you say you'll need, but it's always good to have more trailer than you need, especially if its lightweight.
I imagine it weighs about 1300 pounds as it sits, and would easily haul a small heavy duty tractor, like a Kubota with a loader or backhoe.
A quick look shows similar used priced at $2500 to $3000.
I think its a good to really good deal unless it needs a lot of work.