That's a good video showing the difference between WDH and air bags. It's pretty amazing to think that airbags can actually contribute to overloading the rear axle rather than offloading it.
2017 Forest River Surveyor 247BHDS...
...Tugged by a 2016 F250 XLT FX4 SuperCrew, Shortbed 6.2L, 4wd, 3.73...
...Joined with a Husky Centerline TS 800-1200lbs WDH