I run 412 HD s on my traveling bike and no matter what load I'm carrying it stays on the first (softest setting), frost heave, wash board roads cause me no control problems, but do pound my lower innards to a state of absolute discomfort (I gotta whiz again?). You (and I) need rear shocks with rebound dampening. I will be upgrading to 440 s or Hagon s or even better if I can find the money. Ricor will make you a purpose built set as will a few other shock companies. I feel your pain, my brother.
