It's a very nicely customized Kenworth tractor. It was posted by a camera-handy person from the antique Caterpillar board and I thought it'd get a good view here as well. A lot of folk do this kind of thing with semi-tractors as they're essentially pretty easy to modify, and there are 4X4 and 6X6 models as well. Actually, you could take a surplus 2 1/2, 5 or 10-ton military truck and do something very similar and have the benefit of the PTO winch and monster drivetrain. Hmmmm...