Originally Posted by Buck
In fact, I would even go as far as to say that a WDH setup that still sags a bit will have more weight distributed to the front end than the same setup with just airbags.
I think you need to do a bit of research yourself before you come on here accusing people of not understanding the "basic physics" of this matter.
I don't know how much easier I can explain it.
When weight is collapsing your rear suspension, it PULLS weight off the front.
Do you at least agree with this?
When using them, you of course need to set the height of your hitch so that both the tongue of the trailer and the truck are level, so when you air up the bags, both the truck AND the trailer is level.
When you hook your trailer up to your truck, the tongue weight depresses the hitch, the rear end sags, PULLING the front end upwards. This is where PHYSICS come in to play. When your rear end PULLS your front end up, the weight that USED to be on the front keeping it level, now shifts rearward. Where else could it go?
NOW you pump air into your bags taking the weight off the rear, and here is where it apparently loses you. YOU either having READ the instructions, or being explained the proper procedure(s) by the dude at the RV/trailer store, have already set the ride-height of the trailer and it's tongue by setting the height of your hitch, so the trailer rides level when the truck is level.
You pump enough air into your bags to raise the rear of the truck AND trailer so they're both level, and mysteriously your front end ALSO returns to level.
Why do you think the front,rear AND trailer leveled out? The weight on the rear and trailer had to go somewhere? Mysteriously the front end went back down at the same time, but what caused it?
WEIGHT SHIFT. Air bags don't magically suck up all that weight when they raise the rear end. They do the SAME thing a W/D hitch does, just by using different 'tools' to do so. PHYSICS cause the front-end's weight to shift rearward when you hook up the trailer to your truck, and PHYSICS cause the weight to get shifted back to the front when you raise your rear and trailer back to level height.
I guess I was lucky, as when I had my W/D hitch installed, the installer not only adjusted them so my truck sat level when my trailer was hooked up to it, he also explained HOW the W/D hitch works, and that I would need to sometimes pull the chain(s) tighter as they stretch. By properly 'Maintaining' my W/D hitch, my rear end NEVER sagged.
You either NOT properly mounting your hitch, and/or NOT properly maintaining it, has absolutely NOTHING do with how well air bags and/or W/D hitches work, or how much weight either one transfers to the front. They're both engineered to do the job. Operator malfunction(s) not-withstanding.
BTW, there's also 'Anti-Sway' products on the market, which are NOT the same thing as W/D hitches. They control side-to-side movements, which W/D hitches are NOT designed to do.
In any event, I personally cannot make it any easier to understand, so this was my last attempt at doing so.
Maybe someone with better 'Teaching' skills, who also knows how it works, will chime in and do a better job with it.