The improvement in ride after installing Koni FSD shocks in the rear of our 24 foot Class C is subtle:
A) For instance, the accordian shower door clip (our shower is way in the rear where the ride was the worst) that keeps the door closed used to always jump out of position with the stock Ford shocks in the rear. Now it never does.
B) Also, the extreme side-to-side tipping when exiting parking lots if slightly catching the curb with one of the rear tires is now just a controlled rolling action instead of a violent jerking action.
The above two affects demonstrate both the high frequency -as in our example A), and the low frequency - as in our example B), variable damping response of the Koni FSD technology. A shock with only a single rate of damping - no matter how clever and high quality it's design is - cannot act with the two different damping responses that are required in these two different situations.