Air bags really help, not so much to carry more weight, but will stabilize the truck when carrying a load.
My rear springs are tired, and when the car trailer is connected, the rear end drops a bunch.
Pump them up to 15lbs, and levels it out.
I installed Fire Stone bags. easy to install, just don`t use Harbor Freight Drill bits. Garbage. You want to drill the hole not eventually wear the hole through the steel.
I followed this guys YT Vid on how to install them.
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Goat