We use three D7 LGP Dozers to push the Snow the Snow Blowers shift off the runway as far away from the runway as possible by working as a team and slot dozing. These are the two original dozers around 12 years old and a newer one with 2500 hrs, we also have two brand new Next-Gen D7's arriving on this February's Resupply Voyage. LGP is abbreviation for Low Ground Pressue, which are the wider than standard tracks on these machines so they dont sink into the snow.