I was visiting a friend recently and he had a problem with his coach and Bill Jensen was helping him out over the phone so I asked him to ask Bill about shocks and Bill said that the OEM shocks were only good for 35-40,000 miles and that the adjustable Konis were the best.I have just over 35,000 miles on my coach and I just replacer all 8 shocks with Koni adjustable shocks,2 were totally junk and the other 6 had almost zero resistance in compression.The end result is astounding,my coach has never driven so well and there has always been a noise in the front whenever I went over expansion joints or over any other small bumps,the noise is gone.The coach always seemed to wander due to(I think)swaying,now there is not any swaying or wander.I now go over a large dip at speed and there is only 1 oscillation instead of 2-3.The Konis are very easy to install except for the ones behind the tag which you really need to take the tag tire off to install them.I adjusted these to the firmest setting because from the charts it really only changes the resistance near the limit of the extension.I am so surprised in how much better the coach drives that I would put these shocks a new coach immediately.I know that the factory has to watch every nickel but a 1,000,000 shell with 35,000 mile junk shocks makes no sense.