I wonder how robust the MacPherson struts are on the Duster 4x4, specifically how they will hold up to nine hundred miles a year of rough,rocky dirt road. I want my ride to be as smooth as possible and will happily pay to change them out at the first sign of wear. Speaking of which what are the signs of wear? In normal shocks of course it is when they begin to leak. Also does anyone know are the struts the same front and rear ie same valving and interchangeable? Just curious.