I have the possibility of buying a used Northern Lights Pony Express four-horse walker here locally. It appears to have both the inner 36' pen wall (5' high) and the outer 50' pen wall (5' high). I do not know what size the motor is. Apparently the company that made them is no longer in business, and I couldn't find much about the product on line.
Anyone have any idea what this or a similar product in a decent used condition would go for?