One of the biggest differences I notice between my old 1998 Tacoma 4x4 (BFG ATs) and my LX450 (LTXs) is how they perform on the highway in wet conditions. My Tacoma never 'pulled' when driving through deep water on the highway like my LX does. Is this merely a function of the tires or does the vehicle weight have anything to do with it? At first I was calling it hydroplaning, but I realized that I wasn't losing traction on the vehicle, it's more like I am being pulled into the water if I hit it on one side of the vehicle. I do have LTXs on it (for now). How much is this the tire's fault and how much is it the vehicle's? Do AT or MT tires help this significantly?