As far as WDH and sway control is concerned, my dealer really likes the Blue Ox product as they get great factory support and excellent customer feedback (so they say). Only issue is whether it will fit on the electric slide out models as it needs 33 inches from the center of the ball back to mount on the frame and be usable. I have not gotten an answer on that yet.
Reviews on this product note the lack of noise and that you do not need to unhook it to back up. Videos make it look very easy to put on and off. Reese products do get a lot of traction on these forums though, so make sure to look at them as others have noted. I also wonder if the sway control would add extra stability if you have a tire failure?
http://blueox.com/p-1181-swaypro.aspx