Bordercollie wrote:
What would be the best way to improve harsh ride from rear duals on cupped concrete highways. ( Change rear springs, add airbags or ??) We get out and walk around at rest stops. Tioga 26Q 80 psi in rear tires, 75 in fronts.
A few years ago I had my OEM rear shocks replaced with Koni FSD shocks to see if their dual zone damping would help with the cracks and potholes pounding in the rear.
The FSD shocks did the trick. As an indicator - our shower door latch (our shower is in the rear) would always come loose from the jolts which the OEM shocks would not reduce. The latch has never come loose in the years since installation of the FSD shocks back there.
In fact I think that the relatively always-stiff OEM shocks were adding to the stiffness of my under-loaded rear leaf springs at all times and in all situations. Now the FSD shocks only "auto-adjust to stiff" with the slower happening swaying forces from curves, side winds, from parking lot curbs, and from passing box trucks.
The above are examples of the dual action affects from these shocks - stiff when slow acting damping is required, and soft when quick acting damping is required.
I run 75-80 lbs. pressure in the rear duals and 65-70 lbs. pressure in the front singles. Our 24 foot Class C runs around 12,000 lbs. when fully loaded on it's E450 chassis.