Mike from my experience of 7 years of stock suspension to now Pro Action suspension there is a 100% improvement. I swapped rear OEM air (HD JUNK) TO PREMIUM SHOCKS. Also upgraded the front forks with new valves and springs, and the proper amount of oil. Let me say this in both front legs I didn't drain 16 oz. Oil from Original fill. Our trike rides smooth on rough roads and handles better than ever. Please keep us posted on your upgraded rear suspension I'm very interested in the results. Ride safe Fred