IMO, you can find a nicer trailer than that for $1500. It may not be this week, but keep your eyes peeled. That thing looks like a basket case. I would buy a factory built trailer also. There is a place in town that sells new 18' tag alongs for $1700 (I think) but they are fairly flimsy trailers.
The place we got ours from will sell factory direct. I bet you can get a nice tag along for $2000 new. Horton Haulers. Just get the heavy duty fenders and if you ever need to haul something with tons you can drive over the fender with no worries.