The Commer 4 x 2 tractor was introduced in 1939.   Many hundreds were produced during the war years where they were used by the R.A.F. and Navy.   They were fitted with a Tasker coupling for 'Queen Mary' and other semi-trailers.   The Tasker 33ft. semi trailer (the subject of the kit) could transport dismantled aircraft as large as a Beaufighter.