Just installed an Air Lift 7500XL system that includes the bags, air compressor and associated hardware over the weekend. I had installed a Carli suspension lift that included an add-a-pack feature to my rear leaf springs. In order to install that part of the lift, I had to remove the overload spring (2019 3500). The first time I put my 5th wheel or my car hauler trailer on the rear end it sagged more that I would prefer. The new air bag system is phenomenal! I experimented with both trailers yesterday and the Air Lift system definitely works as advertised. Zero sag after inflation.
In case anyone is interested, I have the Wireless One (2nd gen) system. It came with a remote or I can use a phone app.
Tim