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I would not recommend air shocks. they have a tendency to blow the seals and leave you hanging in the middle of bumville with no shock or support.
I would check into a set of firestone overload bags that can be inflated based on the load. and deflated to a reasonable level when not hauling a load.
They basically attach to the axle tube and frame.
This leaves the shock to pull the dampening duty they were intended for. A good set of Monroe Gas Magnums will do the shock duty.
I'm not crazy about air shocks for increasing load capacity.. you would be better off with heaveir springs..but if you have to, go with the gabreil..monroes are crap..IMHO
The air bags are great and probably a better than air shocks.
I have installed several set of Gabriels and have never had a failure. They are a bit of a hassel because you seem to forget to ad air go to get lumber and there is never air so you want to remember add air before you add the load or have a air tank handy. Also watch were you run the lines keep clear of pinch points and exhaust.
I have a set on my commuter truck and they do come in hady and have a smoother ride than over loads.
They make a little compressor kit you can add on, but I don't use them enough to justify buying it. But the York compressor would be nice just to have air... If you come across the article let me know.
My brother built one once from an old Ford A/C compressor and he used to run air horns off of it, plus a 10 gallon air tank under the truck for reserve.