Originally Posted by northstar1960
Not at all incorrect . a truck is designed to carry X weight . weather it be loaded in the bed .in which case there is no way to put weight back to the front . or a certian amount of TW which in most cases is a 1/3 to 1/2 to cargo capacity . only in extreme cases where the rear end sags so much the lights are pointed sky ward . when i hook up my TH to MY TV . even with out the andersen the TV sits level
You have the classic misunderstanding of the primary purpose of the WDH. You state/imply that a WDH is only needed to level the tow vehicle "in extreme cases". That is incorrect, although it is a benefit of the WDH. The primary purpose of a WDH is to return lost weight (due to TW) to the front wheels for proper handling (steering, braking, etc).
A 1000 lb load carried in the bed (let's assume it is directly over the rear axle), increases the rear axle weight by 1000 lbs, and had zero effect on the front axle. No weight distribution is necessary, because the front has not been affected by the load.
But a 1000 lb load on a trailer hitch (lets assume a 10ft wheelbase, and ball 4 feet behind rear axle) will increase the rear axle weight by about 1400 lbs, and DECREASE the front axle weight by about 400 lbs (note that +1400 + (-400) = 1000 from the TW. And note that this is a fact, even if you have the heaviest of suspensions, and the truck does not squat at all! Weight has still been lost from the front axle.
That 400 lbs lost from the front wheels means a loss of stability, maneauverability, and braking at those front wheels. The WDH is designed to apply a huge torque at the receiver to redistributed that lost 400 lbs back to the front axle. In the process, some weight is also distributed back to the trailer axles, and some weight still remains on the rear axle. That is why the vehicle will usually return almost to level, but not quite.