Helper springs?

[websthes]

I bought a new Mazda a while ago. It's 2008, 4-cylinder, air and auto. I do a lot of renovations and landscaping jobs and want to add some helper springs in the back. I saw something called super springs. They have this roller gadget on the ends of the spring. But they're expensive. I also saw something called load hogs on the internet. Looks like the same concept except no roller gadget. ANd they're not rated as strong. All I want is for the back to stay up when I load it up with a lot of crap.

[quaddriver]

get contact overloads OR the hellwig equivalent. they are 2-3 leafs that bolt on top of your springs and have giant shackle bolts that slightly preload them, they dont start to flex their muscle until you get a load on.