Can I lift the rear with shackles?

famous bob said

they "will" ruin ur springs in time , if their very long ! They aren`t good for handling either.

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I don't want anything "very long" just an inch or two. What about "spring helpers", those bolt on things that bend 'em up a bit? Just looking to get a couple inches more ground clearance front & rear. You'd understand if you saw where I live.