How much of rise on front of truck acceptable when hitched?

valhalla360 wrote:

JRscooby wrote:
Can you explain how the "squat without taking weight off"?
Look at a lever on fulcrum. Add weight to 1 end, weight comes off the other end. The fact the fulcrum moves (rear suspension compression) does not change that.

With simple ball hitch, yes, the frame will act as a simply supported beam and yes, it will take some weight off the front axle if you put any weight on the hitch. Of course, with the really long wheelbase trucks (4 door long bed), it takes negligible weight off the front axle while all the hitch weight, all the in bed cargo weight and any weight off the front axle...goes onto the rear axle. So if you take 150lb off the front axle, you might be adding 1500lb to the rear axle when you are fully loaded. The result is...it will be hard to accurately measure any rise in the front axle while the rear axle is likely doing to drop by at least a couple inches (depends on the truck model...1/2 tons will be more duallys less)

But with a WDH, the trucks frame no longer acts as a simply supported beam, so you can't consider it a simply supported beam.

So you agree adding weight anyplace behind rear axle will reduce weight on front axle. And I bet somebody that paid attention in gee, I'ma tree class could tell you how much if given the amount of tongue weight, distance rear axle to ball, and wheelbase. Now like you say, without knowing the front spring rate, and what percentage of the front axle weight is moved no way to predict how much the bumper will lift. But the fact the rear suspension compresses does not change the amount of weight transferred.
As a pro, I never had much to do with WDH. But just another lever. Fulcrum is the ball. Force applied to trailer end, the load is what is trying to counteract movement the weight on rear axle causes in frame.