Quite a number of members,, including myself, have found that the shackles, bushings, bolts and other OE suspension components are of really poor quality and have replaced them. You can purchase various suspension kits online through trailer suppliers or you might consider something like E-Z Flex (or something similar) which I think hankpage has installed on his 5th wheel.
If you are handy, you can do this job yourself or take it in and have it done for you.
Sorry, can't help you with the springs other than suggesting you take a look at Timbren spring kits. Some members here have had these installed. You can go online and do some research into this particular spring helper.
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2008 Cougar 5th Wheel 27RKS
2005 2500 GMC Duramax
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