On my 2008 Monaco Dynasty 45 Yorkshire I did bite the bullet and take off the original Bilsteins (which theoretically were the "comfort shocks") and put on the Koni FSD. Expensive!! But, WOW a significant ride difference. I do not plan to try the Road Kings at this time and probably never since the Konis have a lifetime warranty and the current ride is virtually perfect (Prevost quality) which is was not before the change.
Jim