This sounds like a good price if the basic trailer is structurally sound and intact. The nice thing about these older fiberglass
trailers is that you can fix everything! They are very much like the old VW vehicles I work on, too. If you have the time and the inclination, you can re-do them any way you desire. Have fun!
Below are my on-going projects: 1968 single cab VW pickup, 1969 VW autostick Beetle, 1986 UHaul