I'd say his shocks are shot. I drive on country roads with no problem. His roads can't be worse that the gravel in rural TN unless he's driving through a field.

Start with looking up the stock ride height & comparing with what he has.

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85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.