This is the BFG M/T:
This is the Treadwright Guard Dog:
This is the Treadwright Backbone:
The Backbone has larger spaces between the lugs compared to the other two and less aggressive sides. Both of the treadwrights seem to me to be based on the BFG M/T, but the Guard Dogs have a tighter lug pattern and look to be deeper as well.
Perhaps the Backbone does have softer rubber, i do not know. I do know that the Backbones are only offered in load range D, where the Guard Dogs are offered in both D and E ranges.
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