My 2008 Diplomat came with Monroe shocks, I changed them out at 7000 miles replacing them with Bilstein Comfort shocks and they are a marked improvement. Great control and not harsh. The Monroe's, when removed, were so weak that I could compress and extend them by hand very easily. The harsh ride that DocUSAF is experiencing may be the same as I experienced, no shocks!
I believe the Dynasty comes with heavy duty Bilstein's, (the Comfort shocks likely can't handle the weight of a Dynasty) and are guaranteed for as long as you own the vehicle (provided you are the original owner). Perhaps Bilstein will replace or repair them for you.
If not I would take MonacoDon's advice and seek out a set of Koni's, they are getting rave reviews.
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