I installed the front and rear units. It took me about a day to do the job. It was not very hard, just spending time on the wrong side of the MH. They are good stabalizers and some benifit to leveling. I use an 18 volt drill to operate the units, this make setup quick an easy. I can lift my C 28 ft about 4 in. Most of that is assisted by the preload in the springs. It really depends on your parking spot and how it is stressing your suspension, you might get more or less on a point. I still use boards or what ever I need when it is a tough parking area. I did shim the rear unit with 1/2 in. to get better clearence between the MH skirt and and top of the unit.
Hope that helps some. I am satisfied for the price