Ever since we had that huge snowstorm, my Dodge ram has been driving like crap! When I am going under 25mph, it shimmies from side to side pretty noticeably, but does go away the faster I am going, and I have to hold the steering wheel pretty firm or it veers to the left very quickly. The air pressure is OK, I checked that first, I didnt hit anything so I have no idea what cause this to happen? There doesnt seem to be any unusual wear on the tires though. Any thoughts?