Hi All, I am currently looking into fitting Air units at the rear of the RV to assist/raise the ride height and reduce body roll. I have found a supplier of Firestone units (Thanks to the recommendation of another FUNster) and apparently Dunlop also manufacture units although they don't list for older vehicles. Has anyone got any recommendations based on Past/precious experience please? Have you ever had a unit fail?These are not the units that fit inside the coil spring units but separate units assisting the leaf springs at the rear. Cheers Steve.