I have Sumo front springs (blue) installed on my motorhome. You'll need a jack with sufficient weight capacity to take the weight off the hanger - about 4 to 5 inches or so. I used a 6 ton bottle jack with 4 pieces of 2x6 in it. Installation is very easy if you have proper tool handling skills. The Sumo virtually eliminates body roll in turns while only slightly stiffening the ride. This is a very useful setup for large truck and RV owners.