In my 04, I didn't run ballast at all this season, although I wanted to-just never did it. Honestly, with lighter snows, I still run in 2wd often. Good tires make a BIG difference. Usually, I'll throw 4-500lbs in my trucks just because. I noticed that with my crew cabs, it really wasn't nearly as necessary as the others were. I also plow with my 03 LB7 2wd. It's an x-cab with a utility bed on it. I ran about 1200lbs of medium to large cobbles in the bed of that and about 70lbs in the rear bags. Rode like a 78 Lincoln!!! It's maiden voyage was on a 8-12" WET snow and it didn't bat an eye!! That's running a Western 8.5 v plow too. I have Timbrens on that truck as well, along with 13 turns on the t-bars.
I run a set of air bag/over shocks up front on my 04. They are made by Arnott Industries and incorporate a Good Year bag around a Bilstein shock. Nice setup, and with the plow up (MVP also), I only see about 3/8-1/2" of squat with 80-90lbs in the bags. I'll give more details to anyone interested, or maybe even start a thread on the topic............