Should I add airbags?

I have a stock 2003 4x4. I don't want to sag, loose ride control and I want to tow more and haul more. On my 1st gen I added extra leafs and stiffer shocks. Looking to add airbags on this one instead. Any brand viewed better than the other? Firestone ones said they add 5,000 lb but they are a bit more than others. The also have the independent control option with compressor. Is it worth it? Any other recommended airbags or solutions?

 

I returned air lift/ride control, holes in brackets didn't line up right, plus looked like major pain to install/cheap product imo. installed ride rite today,fairly eazy 3hr. by my self. way better product, should work fine for me. I have a.r.e. cap & could feel bump stops on our pothole infested roads yesterday.