Here is a vehicle that is designed to move over felled trees and obstacles with ease, and that is by walking over them.
Looking more like alien visitor hardware than a practical piece of logging hardware, the design proves itself in a varied terrain that would cause wheeled vehicles a very difficult time. (As one who has hung up an ATV wheel over a log more than once, I can assure you that wheeled vehicles don't always mix well with felled trees.)
The video shows the device in action, and you have to admit that the six legged vehicle appears to be very strong and stable.
While it does not appear to be the quickest legged vehicle, it would be interesting to see it in action in some varied terrains. My only question now is this – how can I get a test drive?