94 s10 rear spring sag?

[koolky]

A few months ago I bought a 94 s10 2.2L 5 speed for a daily driver. The rear end is lower than the front and im wondering if the rear leafs are just tired? Also, I often put have loads in it (scrap, yard waste, 1 ton axles for my 72 K20, etc...) Can I get springs that are heavier that I can just bolt in to solve the sag problem and get the weight rating up? Lastly, will adjustable air shocks solve any of this? Thanks