I have not yet had a chance to drive my Colorado in the snow, but have had many other full size Z71's from extended cab, crew cab and a couple of Avalanches that have seen lots of snow time up in Casper and Muddy Mountain during Deer season.
TIRES, TIRES, TIRES!!!
Everyone agrees tires make a hugh difference. I have found that the Goodyear AT+S is a pretty decent setup for all around driving, I am sure there are many others.
The other thing is momentum and steady throttle pressure. When you start to feel slippage, don't automatically smash the gas, that will just break the rear end loose, then you panic and get all the way off and lose all momentum.
Thats just my experience, others will chime in with more info and ideas, it's a great thing about the forum.
2016 Colorado CCSB, Duramax Z71 4x4, bose, nav, leveling kit, retrax bed cover, linex, Westin Sportsman Grill Guard Winch Mount, Westin T-Max 9500lb winch, Mictuning curved light bar, Undercover swing case's.