I've always found that the best course of action, unless the road is completely blocked and impassable, is to push on through, unless you know you're going in the same direction of the storm, which means you could be stuck in it far longer than you might otherwise. If you can outrun it great. Otherwise, might want to pick a different direction if at all possible, or wait it out a bit.

Other than that, I'd rather be moving and taking my chances than sitting on the side of the road totally dependent on the driving abilities of others, especially multi-trailered trucks when visibility is low.

I think the truckers think they have so much weight that it will keep them on the road, and for the most part, I think they're right. But at some point, speed over comes all, and then the weight becomes a huge detriment when it comes to trying to stop. I generally trust truckers over normal drivers but in a heavy storm, not so much.