Adding Subframe Connectors - Why not lift them to reverse unibody sag?

I dont have pics of my Maier subframes installed but they about about 2.5 inch diameter pipes that tuck up pretty tightly against the floor pans. They are slightly low but will not reduce your ground clearance. They are very strong, and have save my exhaust from getting ripped off a few times on certain parking lot entrances.

I can put a jack under a front wheel and lift that sides back wheel off the ground by the time the front is up high enough to get a jack stand under it.