You do still see these out and about, they tend
to have been bought by fairs and circuses and are used to tow heavy
trailers or as generators.
"To move guns across rough ground where it was not possible to tow them, the tractor was fitted with a chassis winch. This chassis was therefore eminently suitable for use as a recovery vehicle, or breakdown tractor, to use the then current terminology. The breakdown tractor was put into production in 1939 a year or so after the gun tractor. The first 43 breakdown tractors, designated SV1S or SV1T, were fitted with folding cranes which, when not being used to lift a vehicle, folded down into the central well of the body. This was a method of reducing the height of the vehicle for carriage on trains or transportation overseas. One at least of the very early Pioneers was fitted with a canvas topped driver's cab. When the all steel cab was introduced, the height of the vehicle remained about the same, as the main jib of the folding crane did not lie completely horizontal. The mechanism for folding and unfolding the crane was complex and the operation time consuming, to run with the jib in the raised position resulted in an unwieldy vehicle. For these reasons a simpler jib was introduced in the design of the later breakdown tractors, designated SV2S." (www.rememuseum.org.uk)
The Dinky was added to the catalogue in 1957 and remained in production until 1965. It is always in military drab green. In 1960 it got windows and in 1961 it got plastic hubs and these are the only listed variations. The one to look for is tha last release with windows and plastic hubs.