Some people like the supplemental air springs and their ability to keep the TV level is a plus, but they are no substitute for a WDH. They do not relieve the TV rear axle of the extra load and they do not distribute part of that load to the front axle thereby regaining lost steering ability. They merely add stiffness to the springs that are already there preventing the TV rear end from drooping as much. I would be dubious about their ability to "add 1000lbs to towing capacity".
Just my opinion.
-Paul
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