I've got a unique aircraft tug for sale. It's an Eagle Bobtail conversion. ZF 5-ton axles, 4-wheel steering, and also has a snow auger added. It only has 78 miles (33 hours run time). Rated to pull 60,000lbs. Link here:

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=130331389556