I have to disagree in part. If you are running short arms or an out of the box generic long arm kit from RE or such then it probably won't work as well. I know all of the comp guys run some sort of rear setup for the most part, but they are also trying to do different things than we are with less weight and more travel.
I don't run a sway bar on either end and I know that my rig works stupid well and is more stable than 90% of rigs that do have sway bars.
That being said you will be safe and more in control with a rear sway bar driving it on the street. Just replace your bolt and use a lock washer and some lock tite on it.