So if they will or may go through a tractor tire how are they any good?
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The heavier the york rake the better to pull out the debris.
It would be more cost effective for you to have a logger come in with forestry
mower and level the place and then use the York Rake to clean up.
The more you rip out of the ground by dragging with the York Rake
after the forestry mower levels the place with a flail head the
less material you leave on the surface.
As I said the better one time solution MAY be to rent a small dozer
with a six way blade and be done with it the first time.
Unless your willing to try to rip out every absolutely every tree with a
brush grubber which will require huge amounts of traction you will be
doing it for months anyway. even then you will have roots sticking out of the
ground and roots coming up after a frost.
Been there done that with family member that insisted on being his own
logger rather than having a logger come in and clearcut.
I am not putting my hand on your walle, I am only relating real world experience to you.