WD hitch is not about helping the truck carry the weight. It is about keeping the truck's weight balanced between front and back wheels and with good steering and braking control.
Add the weight of the tongue to the point where the ball is at, several feet behind the rear axle, and no WD hitch. Now the rear axle acts as the fulcrum of a lever and it's taking several hundred pounds off of the front wheels, which you count on to steer and do most of the braking for your TV. Probably you can still steer and brake, but you'll be doing it with much less margin for safety.
WD hitch counteracts the lever effect and prevents taking the weight off of the front wheels. Your truck's steering and braking should be much more like it is without the tongue weight. In the event of an emergency situation, you will have much better control when a WD hitch is being used.
It takes maybe an hour to set a WD hitch up properly and get everything adjusted. After that, it takes only a couple of minutes to do the extra hookup each time you're hitching up.
Besides WD hitch, I would recommend sway control. I used to tow the little TT in my signature with my last truck, which was a 2500HD with 8600 pound payload. I tried it the first time with WD hitch but no sway control. The extra $80 for adding a friction sway controller was a good investment -- made for much more relaxed driving.
Wayne
