The wheels on a skid steer typically have no steering mechanism, they are in a fixed, straight line relative to the body of the machine.  By turning the left and right wheel pairs at different speeds, the machine turns by skidding, or dragging its wheels across the ground.  The rigid frame and strong wheel bearings prevent the torsional forces caused by this dragging motion from damaging the machine.  This skidding motion tears up the ground on which the machine operates.
Fifty-five farmers and assorted country folk clustered around the auctioneer. Bidding on the New Holland was fast and fierce. Then, the Kubota was up. “$15,000, can I get $15,000,” the auctioneer sang through a megaphone. “How about 10? Can I get 10? $10,000?” My buddy Kyle had told me never to bid first. They always start high, so wait for the drop and let someone else kick it off. “Nice Kubota, backhoe, good machine, how about 7, can I get 7?” A card went up. A guy in overalls near the front had bid. “We have 7, how about 7-5, 7-5.” Shaking like baby deer, I raised my card. “7-5, in the back. Can I get 8, 8, 8?” Overalls raised his card. “8-5, 8-5.”
The make and model category is further divided into the purpose in which a driver sits on the machine and drives it, and the other where the operator works alongside the vehicle. The type of drive is further broken down to wheel type and track type. The wheel type is then broken down into two, three, and four-wheel types of drives, while the track type is subdivided into full and half-track types of drives.