Last year was our first time at Tulsa and staying in our trailer. We found the facilities to be excellent, and very reasonably priced. It's only $18 per night with electrical hookup. The showers are kept very clean, and the laundry room is very handy. It's quite a distance from the campground to the show barn, and many people either drive or use their scooters, but you can walk there in about 10 - 15 minutes. It was extremely hot last year, so walking wasn't much fun. The trailers are parked quite close together, but it was nice and quiet.
If you choose to stay there, you must make your reservations separate from your show entries. We found the staff there to be very pleasant and helpful, and there was usually someone at the office if we had questions or needed anything.