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I had that type of helper springs on my 01' Mazda B3000, mostly for when I drove with my quad in the back. I thought they worked well, they didn't really effect the ride quality unless you had them really tight. Being adjustable was nice, and a relatively quick job. The only thing that I'd be worried about is the stress that they would put on your spring pack when under a heavy load, especially if it's for a long time.