I have a 2013 RW415 that we purchased last summer. We're very happy with the rig, but the ride could use a little improvement. It really doesn't like concrete pavement with any kind of defect, expansion joints, etc. I'm considering the MORryde SRE4000 in hopes of seeing an improvement. It looks like the rig currently has the Dexter E-Z Flex triple system, and at least one of the rubber donuts is deteriorating. To be honest, I can't see how the E-Z Flex absorbs much road shock compared to the SRE4000. Has anybody done this upgrade? How does the SRE4000 compare to the E-Z Flex.