there are a few different weights of the bbs, though... keep that in mind. I used 2000ct bottles of .25g bbs. That's roughly 17.6 ounces. But the most common bbs are only .08g each so 2000 of those would only be 5.6 ounces.
The chart says to use 6oz for each tire, but given that Swampers require a lot more weight than normal, I'd recommend 8oz if you're using a factory or alloy wheel and 10oz if you're using cheap steel wheels. Better safe than sorry is my thought. The cool thing about using bbs for balancing is that you can use too much weight without problems. The extra bbs will just spread out as needed.
There will be a little noise when you slow down to around 1-2mph and the bbs lose the centrivical force holding them in place. Sounds kinda like a hole in the tire at first, but a little plastic-y sound. PSSSSS. You won't even notice it after a few weeks unless the windows are open.