Helper Springs on C20? Good/Bad Idea?

[YourBuddy'sTruck]

Hello, Fellas.
I've a 70 C20 that I haul a heavy load with once a week.
It has a FF Axle 14 Bolt Rear End with the 6 Leaf Springs.
My passanger side lists more than the driver's side.
Would Helper Springs be a good or bad idea?
Or, am I just pushing the limit of a C20?

It's a nice "work truck" and it makes me money, so I don't mind spending some on it at all.

Thanks for any advice or suggestions.
Cheers!