The Engineer that designed the Alpine chassis is the one that does the Powerglide. Tiffin decided to build their own so they can customize to fit their floorplans and also to prevent the massive headaches and customer dis-satisfaction that occurs when trying to deal with Freightliner on warranty issues. Doug
My buddy has one on his 2009 Tiffin! He told me that Tiffin by building there own proprietary chassis can custom design each chassis for a given floor plan. IMHO a big step for Tiffin there following the steps of Country Coach (Dynamax - there own proprietary chassis) and Alpine (Peak there own chassis).