The 2016 Monaco Diplomat 43SG combines serious diesel performance with an unusually sophisticated chassis and a luxurious residential interior. Powered by the Cummins ISL9 producing 450 horsepower and 1,250 lb-ft of torque, the Diplomat pairs substantial power with an Allison 3000 Series transmission and a Roadmaster chassis engineered by Freightliner. Independent front suspension with a 60-degree wheel cut and a passive-steering tag axle give this 43-foot coach impressive maneuverability for its size. MHSRV

Inside, the 43SG uses a three-slide bath-and-a-half floorplan, including a full-wall slide that creates an exceptionally spacious living area. Premium Villa furnishings, solid-surface countertops, residential appliances and upscale cabinetry give the interior the residential character expected from a luxury diesel pusher. The private rear suite incorporates a large rear bathroom, while the additional half bath provides convenient accommodations for guests.

The Diplomat is particularly well equipped for extended travel. Diesel-fired Aqua-Hot provides hydronic coach heating and continuous hot water, while dual-zone electric heated tile floors add another level of cold-weather comfort. A residential refrigerator, induction cooktop and stackable washer and dryer further enhance its long-term livability. MHSRV

Its electrical and climate systems are equally substantial, with a 10.0kW Onan Quiet Diesel generator on a power slide-out tray, 2,800-watt pure sine wave inverter, automatic generator start and 50-amp electrical service. Frameless dual-pane windows, a one-piece fiberglass roof and substantial basement storage round out a coach built for serious travel. MHSRV

For travelers looking for a luxury diesel motorhome that stands apart from more conventional tag-axle coaches, the 2016 Monaco Diplomat 43SG offers an impressive combination of 450 HP Cummins power, passive-steer maneuverability, residential comfort and premium all-season systems.