One of the real joys of towing with my 2500HD's (I have had three of them) is not having to mess with a WD hitch when towing 6,000-7,000 pound travel trailers. The same cannot be said of my F-150's (2) or my Silverado 1500 (1). If you have sway, then you have a problem. Fix it and you won't need a WD hitch with the weights you are considering.
GM, and I, don't have a problem with losing a few hundred pounds off the front axle. That is an old old complaint dating back to the days when we towed with sedans and station wagons.
