My experience they're not too difficult, and often better than smaller vehicles, particularly if all wheel drive. Deep snow tends to be alright as there's grip there, it's compacted icy snow and ice that are more problematic; the key, as others have said, is remember the amount of mass / inertia you're driving and take things very cautiously and gingerly, because if it gets away from you it'll be a while before it stops!
I'm not a great fan of bargrips either. I also think trucks such as RL, K9 etc tend to be better behaved than, say, Explorers and the like; my experience (on mud as well) is that Explorers tend to skate about on a slippery surface rather than cutting through to the grip. I think this might be a ground pressure thing - or maybe it's just the bargrips!
Steve, why the downer on Goddesses? - OK the body's ugly as sin, but it's still an RL...