snow and ice on a rolling bed cover

I'm thinking about getting the retrax pro or maybe even the retrax power pro but I'm concerned that in the winter (I live in Northern NJ) when we have ice and snow if the ice will become a problem when I need to roll open the cover.

Anyone have any experience with these covers that can comment?

I am also looking at the bakflip g2 ir bakflip vip. I really like both designs but am having trouble deciding which to get.

I'm leaning towards retrax because It seems like it might be more secure than the bak flip and I need that since I will be carrying expensive tools and equipment in the bed.