"Just to clarify-wheel weights will not increase the load on the rear axle bearings because the weight is on the wheels and not the tractor frame. "
Matt, your statement is perfectly true, IF you leave the tractor parked in the garage for the rest of its life. Your statement is true in a static situation.
Add the dynamics to the situation (driving over rough terrain), suddenly the calculations change.
Without wheel weights, the impact load is a small load (wheel, tire, and axle) impacting through the bearing to the heavy transmission and frame weight.
Add weight to the wheel, the dynamic force between the two goes up.
Hit your fist on the table.
Add 50 pounds to your fist then hit the table again.
Which hurts more?
Add 50 pounds to the table and hit it with your empty fist. That will hurt less than a full fist.
"Proper balance in life is the key to success!!".
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