The hitches have limits the one I have says you can’t go any higher than the 4th link from the top. I’m at that link and it still drags a bit on the tongue. I used to own my own RV business selling RVs, repairing them, towing them, I was a truck driver, etc. Towing I know and enjoy. There are circumstances where airbags are needed. In my case for example. Or for more control. The WD is not designed to redistribute all the tongue weight, just some of it. You do still want the ideal 10% of the vehicle weight on the tongue. If that causes the tow vehicle to squat too much you can use the WD to help level it out but if you over do it you can cause an upward strain on the hitching gear, a strain the gear wasn’t designed for. This is where airbags can come in. They’ll help stiffen up the rear spring and help level out the rear of the vehicle. They are not a stand alone they are to be use together with a WD hutch to ease the strain.
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