Installed the 88138 Air Lift Kit on a 23 foot Ithaca RV with an F350 chassis. The hardest part was jacking up the RV. We did not remove the dual wheels. They removed the factory bumpers, pre-assembled the left and right assemblies, placed them in the desired position, aligned them, installed bolts into the top brackets and the existing holes in the frame. Lower the stacker until the bottom brackets touch the axle, then secure the air springs with the clips provided. I moved the air ducts on the left side, using the existing wheelhouse openings. Aired them out to 70psi and got about 2 1/2 inches of travel on the back of the unit. Very happy with the performance of the air springs so far.
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