It's hard to say without seeing it but there are buys like that out there. I have a $500 dollar special in my driveway that I haven't spent a dime on other than a few coats of Snow Roof in 5 years and we camp in it mostly during hunting season.
I have another one made by Kit that is going to be a flat bed wood /cargo trailer when my son is done with it and they go for an easy $1500 around here.
For $300 bucks, I'd buy it if it was in any kind of decent shape and towable.
Lance 9.6
400 watts solar mounted/200 watts portable
500ah Lifep04