As I've posted on other shock threads , I have no experience with the koni's but have put the Bilsteins on both my used "new to us" MH's smaller 23ft and now 25ft C.
Saying that the Bilsteins are night and day difference over the stock GM shocks !
Yes they stopped the pogo ing and the harsh slams in the rear.
But both of mine were on the GM 3500 NOT a 4500 or Fords 450 chassis .
I did test drive two Mh's on Ford chassis (1 brand new and another with 11K miles )and both were 450's and both slammed hard going over speed bumps very very slow and the cracks in the roadway on the freeway big time !!!
Not trying to bring up a Ford vs GM , but the Ford just rode harsher then the GM did , maybe its the nature of the beast IE: being a Ford 450 ..
As for JD saying he might put the koni's on the rear ( he has new ford shocks on the front) well that's another can of worms "mixing shocks" :) lol