 The vast majority of Triple-Ds were sold in the UK, but a number were exported to the United States and elsewhere.The main disadvantage with the Triple-D was the lack of suitable implements for such a powerful tractor, this meant that Ernest Doe & Sons also had to develop and build a range of implements to sell with the tractors.Other disadvantages stemmed from the use of two engines, this made controlling the tractor more difficult because of the need for two gearboxes.