Goldencrazy.....this is far from scientific, but here is what I found. On my previous coach, a 2005 Monaco Diplomat, I changed out the 8 shocks to Koni's at about the 10K mark. The ride was night and day better, especially with my biggest complaint, expansion joints (short frequency) jolts. I also changed out the shocks on my current coach to Koni's. The difference was not as dramatic.
I looked at Road King ads and you couldn't even find a price....I know they're very expensive and cost prohibitive on the Monaco which requires 8-10 shocks. As "dons2346" stated, they would probably be overkill for your coach.
Now to my point.....I'm a Koni fan and think the Koni FSD's are the best fit for DP's, but after years of reading posts on here and another forum, it seems that the majority of Class A gas owners are happier with the Bilsteins.