 Danish Ministry of Transport approval was also necessary and all testing on its behalf was carried out at the University of Denmark's laboratories.Appropriate care had been taken in lengthening the chassis frame, and after the lengthened propeller shaft had successfully undergone testing which would have revealed any shortcomings such as vibration due to run-out, or critical whirling (resonant) speeds the conversion received the approval of the Danish ministry and Ford of Britain's senior truck engineer.Ever since the days of the first Model T trucks the Ford Motor Company always had a vehicle in the popular 10/15/20 cwt category, although with the speedy 15 cwt normal control model of 1939 being discontinued a year or so later only the E83W 10 cwt van was available immediately after the war, whereas Morris had their 10 cwt model Y and the PV 15/20 cwt, both of them prewar designs.