I'm not sure I can help with your specific model, but I just installed Koni FSD shocks on my 2010 F53 Chassis along with a couple other mods and I could tell the difference in the shocks almost immediately.
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Thom Boles
2010 Winnebago Vista 32K with a 2013 Mini Cooper S Roadster toad.
Kg0gp, You might look at the web site ULTRARVPRODUCTS.COM . I bought replacement front air bags from then, and from SHOCKWAREHOUSE.COM I bought front and back replacement shocks.