I don't know about the Goshen fairgrounds, but I've been to a KOA near to Shipshewanna (which isn't too far from Goshen & not far off the tollway). I'm sure they have full hookup sites. Also, the town of Shipshewanna is a nice stop with lots of quaint shops & local Amish artisans. It would be (IMHO) a more interesting visit than Goshen. If you're just looking for a quick overnight stop, the KOA would be fine too. You'd just skip the Shipshewanna tour & be on your merry way!
1964 Bambi II
1988 Avion 32S