We purchased our Silverado New. It already had the towing package.I would add the airbags and a rear swaybar to your truck if it doesn't have a factory swaybar. '99Heartbeat (Mike) has the airbags on his truck for towing his boat and seems to happy with them.
---------- Post added at 10:54 AM ---------- Previous post was at 10:52 AM ----------
Do you have a weight distribution hitch? They work very well.