A question for the experts: Somewhere I heard that unless a shock is leaking fluid, its working fine and doesn't need to be replaced due simply to mileage, for example. Please don't take this the wrong way, but many who replace shocks go to great lengths to extol the virtues of their new purchase. Is there any quantitative, objective way to tell if replacing shocks make a difference? And no, I can't push down on the corner of my coach to watch for the rebound.......