Umm... I could be wrong, but I think you're reading stuff that's intended for E-series Ford owners. If there are any OEM suspension upgrades offered by Chevy, probably won't hurt to get them (except cost), but the Fords seem to be much more likely to need help in that department. I pretty much agree with the post above; get the tire pressures right for the loaded weight and drive it some. The Chevy cutaway has an excellent reputation here for good handling /driveability.
Jim, "Yeah, I'm lost. But darn, I'm making good time."