I/we love our Air-lift systems airbags and have had them on every pickup truck since 1993 and won't have a truck without them. Totally and so easily adjustable for any or no load and is riding on air! Just a balloon and no other overload enhancements ever. Outstanding plus! Gives side to side adjustment for weight also.
Never had one leak or failure and the one truck now has over 400,000 miles on it and the bags and all lines are still the original. That truck has been used to haul produce crates etc to markets and heavy stuff for the farm ever since we sold it to him in 2004. Had hauled our 9.5' Lance TC and our Carriage 5th wheel about 168,000 miles before we'd sold it as it was only used for RV'ing use.
Why anyone uses other types of overloads is beyond me as there's no comparison in ride, load handling variables, and so little added weight to the vehicle which of course, means any added weight lowers the cargo carrying capacity of the truck on it's tires and axles. It's no brainer!