2005 Monaco Diplomat Diplomat 40DST Bath & Half, The 2005 Monaco Diplomat 40DST is a luxurious Class A diesel pusher motorhome that measures 40 feet long and features a triple-slide floorplan designed for spacious living and extended travel comfort. Built on the sturdy Roadmaster Raised Rail RR8R chassis with air-ride suspension (including eight air bags and Monroe shocks), it delivers a smooth, stable ride powered by a Cummins ISL 400 HP turbo diesel engine paired with a 6-speed Allison MH 3000 transmission.