The Cessna 337 is widely used in Canada as a "Fire Spotter", if one is low on fire work and the front engine quits it flies quite well on the rear one, however should the rear one go on a typically hot/bumpy/smoky day , one has ones hands full to stay out of the trees, for this reason its normal to have just one spotter along with the pilot as the tanks are allways full at the start of a flight, skiny spotters are much in demand!