I have two of those tire drive Sidewinders, a 6' and a 7'. The 6' is in better shape, but the 7' cuts better. My dad always kept a Sidewinder when I was growing up and I spent many, many hours bushhogging Tennessee hillsides with them. Used his 3000 Ford to pull them, and they would chew up literally anything that the tractor was capable of pushing over. The 6' I have is the last one that he had, the 7' is one I bought just a few years ago. The deck is rotten on it, but it cuts like a champ. The 6' has the hand crank height adjustment, which is frozen, and the wheels are on either side of the deck. The 7' has a hydraulic height adjustment and the wheels are behind the cutter, so you can mow closer to fence rows with it.