I've had the Koni (red colored) adjustable shocks on our Phoenix Cruiser for 10 years now, installed just a few months after buying the rig brand new back in 2007. They have always been set to the stiffest setting. We only have 32,000 on the rig. They do a good job. At that time in 2007, the Koni FSD shocks were not available for the E350/E450. If they were, I would have paid the extra money and have gotten them instead. The FSDs are now available for the E350 and E450 motor home chassis, I believe fitting as far back as a 1991 chassis. The beauty with the FSDs is that the many minor road imperfections are reduced when cruising the open road, improving the quality of the ride.
Here is one of our red adjustable Koni shock absorbers. I understand you need to take them off the vehicle, either fully or partial, to adjust them. It was recommended to me by the RV suspension shop to set them to the stiffest setting because of the consistent heavy weight of the motor home.
My red Koni adjustable shocks did NOT come with a lifetime warrantee.

Not meaning to change the topic here, but it is related....Has anyone tried
Sulastic Shackles? I would give them a try but the $400 price tag is too steep to experiment with.
