Neither. It is an accessory that mounts underneath the tractor itself. You can see a version of it here:
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It is an incredibly powerful unit. I ran over rebar that was vertically in the dirt like a post that was one inch thick and the thing sheered it off without me even knowing it! Sadly, it also tore off the sprinkler that was next to it also.![]()
Yeah the Bushhog will eat anything you can get under it. Saplings are a specialty.