You are going to feel more "tail wag" with aggressive tread tires.  I have even noticed this in passenger cars, when snow tires are put on them. The flex is not necessarily from the side wall.

my $.02

John

"I have the BFGs on the rear @50 psi, and Y370s on the front at 44-48psi, and this seems to work best. I do still feel the tail wag more than when I had Y370s all around."

The next thing to being clever is being
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-Mary Pettibone Poole