That is pretty heavy squat, you need to reset your weight distribution hitch bars, and potentially the height of the ball itself to eliminate this imbalance. Could be as easy as lengthening the chain on the bars when you cinch them in to place, but I'm betting if you place the trailer just behind the truck, unhooked, and level it out, that the ball is misaligned as well. Perhaps do that, level the trailer, and take a close shot of it to post here (perhaps a stand alone thread so as to not thread drift this one further).
Bill