I dont know about Tusk,but Komatsu gear always seems to be very lightweight and cheap,we on the other hand had experience with Linde's and they proved to very expensive when it came to maintenence time,even when they sold the units as having the lowest total cost of ownership.We have been running Crown SC4040's for the last 3 years and they have proved to be the most solid and reliable and also the cheapest to maintain in a cold storage hard inviroment.