In Britain, as well as in most other countries, the changeover proceeded slowly during the 1920s and early 30s because little money was available for defence. Furthermore, the dragon was not proving an unqualified success. Although its cross-country performance fulfilled expectations it was slow; the Mk 1 could manage only 12 mph (19 kph). The Mk 2, first produced in 1933, was faster at 30 mph (48 kph). However, dragons were expensive, and long-distance road travel - to be expected in Europe - proved hard on tracks with unexpectedly steep repair bills. Consequently the RA continued to seek less expensive methods of moving its guns. During the late 1920s the RA experimented with a number of wheeled tractors - including some 4x4s - and even tried the French portée system.