[argonaut]

Keep caster angle at at least 4 degrees with respect to the ground and you'll be fine.
I can't say that I've ever experienced this "death wobble" personally but my assumption is that it is caused by poor suspension and steering geometry. I run 35" tires on a dana 44 front axle with a bolt in shim giving around 4-5 degrees of caster and it is smooth as silk at all speeds with no steering dampers. Also make sure you properly torque all u-bolts as non torqued bolts can add to vibration and oscillation.

Personally I only use short blocks and shims that bolt into the leaf pack. You can get angled shims at multiple angles pretty cheaply from partsmike.
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