2011 Tiffin Phaeton 40 QTH w/4 Slide-Outs Model 40 QTH with 4 slide-outs. A very nice coach loaded with desirable equipment. Built on a Freightliner Chassis with full air ride suspension & air brakes, powered by a Cummins ISC 380 hp turbo diesel (pre DEF), Allison 6 spd. auto trans, 54,890 well maintained miles, exhaust brake, auto hydraulic levelers, rear monitor with side cameras, Onan 10 ...