Gardner Stone is from Middlebury, Vermont and I believe he has the most spectacular pulling tractor in the world. This is the NTPA's unlimited class, and the [tractor's] weight limit is 7900 pounds. In this class, you can have as many engines and bring as much horsepower as you can... but your tractor must weigh 7900 or less. The FOUR (4) turbine engines that you see are Lycoming T-55's. They were used in the Chinook helicopters and are about 3000 HP each. I actually have a lot of video footage and pics of his tractor, and i will probly make a tribute video some rainy day. Gardner is a really nice guy and he owns/operates G.Stone Motors in Middlebury, VT.