Thought this info might be good to post out here.
When I bought my new 2006 Chevy 2500 HD Duramax, I knew that the factory suspension was "soft" and I intended to pull my construction trailers (and a travel trailer later) down the road and on the interstate.
I first replaced my OEM sway bar (front only is original equip) with HD sway bars from here:
Frederico Performance Swaybars and Suspension Products
These are top quality solid bars with good quality hardware. Not Hellwig standard issue junk. The package includes a substantial rear bar as well. I did the install myself and I don't like being a mechanic.
At 500 miles, I replaced my OEM shocks with Bilsteins that I bought from
Easy install myself without removing any wheels.
These two changes made a dramatic difference in the handling without ride sacrifice (IMHO). I would never be without HD sway bars. They make more difference in control than tire pressures. Well worth the $$$.
I am pretty sure that Frederico Racing makes bars for Burbs as well.
Have fun and drive safely !