During the war it seems as if just about everything was tried or tested. This includes a jeep with complete tracks. In the picture below the jeep sports eight tires plus tracks. You can find out more about rare jeeps from WW2 in the following book:
The first book entitled Rare WW2 Jeep Photo Archive, 1940-1945 includes a ton of photos of specialized jeeps. The second book entitled Rare WW2 Jeep: Following On No. 1. Both books are by Mark Askew and are excellent resources. Consider adding them to your collection of books today.