Those airbags require a minimum of 5psi in them at all times.
Prior to using your truck with weight in the bed or towing you would have to fill those bags to your desired psi.
Typically they only come with the air inlets....so you'll need to fill them up by yourself.
Some have added an on board air compressor to alleviate this.
There are choices, which is the good thing.
If you need these parts, let us know