 There were two engines and gearboxes to maintain and repair and the probability of breakdowns was increased.By the late 1960s several companies had developed single-engined tractors capable of producing over , this competition put the Doe out of production after over 300 had been built.The Triple-D often makes appearances at agricultural fairs such as the Epworth Festival of the Plough in Epworth, Lincolnshire and LeSueur, Minnesota Pioneer Power Days show where it is always a crowd favourite, popular due to its unorthodox build.