Donnie,We appreciate your experience and knowledge of Prevost and various conversions.I have had 3 coaches all with cruise airs and I have a Renegade Toter home for a tow truck,my experience has been that the roof air last 5 years on the toater home and the cruise airs do not fail(this is my experience).I see many post by others who have or are going to replace their roof airs at 5-8 years but not post of problems with cruise airs.You state that cruise airs fail 100-1 verses roof airs,why don't we see this on this site,maybe there is a problem with the installation in the type of coach that you are servicing.POG members might service their cruise airs better than the rest,I don't think so.If I were looking to purchase a new coach I would want OTR and 4 cruise airs,this has worked for me.