2015 Airstream Interstate M3500 with V6 Diesel Engine on Mercedes Sprinter Chassis. For sale! V6 Diesel Engine on a Mercedes Sprinter Chassis, Onan Generator, Only 23'1" long, sleeps 2. At 23'1", it’s easy to navigate and sleeps 2. Onan Generator for off-grid power. For sale. Visit Lakeside RV Repair for expert maintenance.