Ron, I tried the Koni shocks. They lasted 40,000 miles. The only difference in ride was my wallet was much lighter. I wasn’t impressed and noticed absolutely no improvement in ride… sadly.
Oh my, that is a very poor review on the Koni FSD shocks.
I wanted to buy the Koni-FSDs back in 2018 but couldn't justify the expense and NO lifetime warranty either. I decided to go with heavy duty Bilstein RV shocks for the price and lifetime warranty. Admittedly I am a bit surprised how happy I am with them. I was concerned that the HD Bilsteins would jar our rig more, but apparently there is enough mass and weight that there was no noticable worsening.
Another change I made two years later in 2020, was replacing the front coil springs to a pair of the next rating lesser because our PC front suspension had too much weight capability that created unnecessary thrashing up front. Our PC still has margin, but not so extreme. The ride up front is more comfortable, and the house likes it too.
I also adjusted front tire pressure to 55 PSI which could be afforded due to our lighter front end. Between all the changes I made since 2018, the house thrashes a lot less. I wished I made the changes when the rig was new, but I was shy in making such changes back then.