I run a Kelderman two stage air ride kit which works in a similar way.
It replaces the rear spring hangers with a big hinged bracket that rides on airbags, to take the harshness out of the ride. It’s mainly for when you’re driving the truck empty and don’t want to be beat half to death.
If the sulastic hangers work as well, they’re worth having, IF you drive your truck without the camper more than with it.
My camper is on less than 1% of the time, that’s why I have that plus overload airbags rather than stiff springs and Timbrens.
If you only own a truck to carry a camper then I’d skip any of this and just put in big springs.
2017 Northern Lite 10-2 EX CD SE
99 Ram 4x4 Dually Cummins
A whole lot more fuel, a whole lot more boost.
4.10 gears, Gear Vendors overdrive, exhaust brake
Built auto, triple disc, billet shafts.
Kelderman Air Ride, Helwig sway bar.