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Yes.............sorry for the delay in someone getting to your question. I have never heard of any Bilstein shocks that didn't say that on them. And those are great shocks as are Konis. Either of those would offer a better ride than standard shocks. I am attaching a link to some other improvements you might consider. I have several others I can offer as well. Hope this gives you some ideas to check out. Read the blogs on them as other owners are a good source of what works and what doesen't. All follow ups are included if you need more on this later. http://www.glide-rite.com/Air_suspension_system_p/4-bag%20full%20air%20suspension.htm
Another source that you might check out........... http://www.vbairsuspension.com/en/item/178/full-air-suspension-vb-fullair-2c-mercedes-benz-sprinter-409-524-rear-axle-2006-current-medium.html
And one other............and I have used their products on any number of applications with good success. http://www.topix.com/forum/autos/dodge/T1I5T41QS724GM8K5
I should have mentioned that the Koni shocks are adjustable and one reason for them being more $$$, but most say they are worth it!
Did you have a chance to look into some of the various upgrades I mentioned?