Let's use that last picture as an example. Do you really thing that Jeep is gaining extra traction with the PS front tire? It is not being "forced" to the ground.
Actually, along those lines I have wanted to see someone put some scales under the PS front tire that's on the ground on the Articulation Rack to see just how much force is being applied to the ground from that tire.
I have seen many of them, and quite honestly the only point of the articulation in those situations is to keep the vehicle from flipping, not gaining extra traction.
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