With the plates I was thinking of a layer of UHMW or Teflon in between the steel. Very slippery. Yes, I agree the box and cap need not be rigidly attached to each other. The accordion seal is what I'm thinking right now. I am hoping to reuse whatever is there when I pull the sleeper off. My thinking is that both the cab and the box should be bouncing in the same direction. Yes, shocks for dampening did come to mind.....
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