One other thing, standard snowmobiles are geared too high for pulling. At 5-10 mph pulling a groomer, the snowmobile consumes a belt every 10 miles. That's why all the ones used to pull nordic groomers are Ski Doo Skandics or an equivalent from another brand. Those sleds typically have a 2-speed transmission for tractoring around, a much wider and longer track, and reverse. They are heavy beasts weighing 650+ lbs, which makes them very tough to dig out of a snowbank when they get stuck!