Mine is a mobile home axle. Buried half int he ground and welded the arm to the wheel...The first one I ever saw was a cat in the NC mountains. It was a 24ft jenny with the inside inner 10ft had a table mounted on the arm. It served as a turntable and a jenny. The only issue was using the turntable one would have to be 14 or so feet away from the dog. It was a neat device. EWO