I have not heard of many runaways. If its going to happen, probably not in your driveway. The K rail would not work for tracked. They are usually around 6K pounds for a 20 foot stick. You could pour a 4 to 6 foot wide wedge that would fit between tracks and lift hull and tracks off ground. Still have to shut down engine. The ramp would have to be long and high enough to lift majority of track to keep it from moving forward. I would not worry as long as you keep good service.