Saggy IROC

So, having purchased the worlds shittiest iroc this summer, its now at a point where daily driving is eminently possible(rust cracks in floors “fixed”, brake system overhauled, all fluids but trans changed, no oil leaks), the question of suspension now needs to be addressed. I stubbornly insist on both using it as a truck replacement (see photo) and intend to put snows on and drive as much as possible this winter(i do have a second car if this turns out to be a death wish)

Illustration for article titled Saggy IROC
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However, as can clearly be seen, its rear suspension is somewhat unhappy. This is just loaded with cargo, with people in the back and cargo it very nearly rides on the bump stops. Currently trying to decide which path i wish to take in addressing it before it becomes too cold to wrench(no garage, living in southern quebec). The no cost spared option is to get new springs, new shocks, and airbags to go with said springs. Total would be about 300 cad. Other options are only new shock and springs(120ish), or just airbags(do the math). As a university student, new(good) winters are already a sizeable purchase, so id prefer to avoid the all out option. New shocks and springs would likely fix static sag issues( it noticeably drops while filling gas tank) but im still somewhat worried about the sag under load. Opposite that, we have airbags, which wont raise the static sag, but will almost certainly eliminate sag under load if planned for. Looked into air shocks as the killer solution, but 3rd gen f-body shock mounts are just sheet metal and so though i can purchase them, i have some worries about punching out said mounts if i hit a bump fully loaded. Fairly new here, but oppos advice would certainly be welcomed