KUNG is the English transcription of the Cyrillic initialism КУНГ for Russian: кузов универсальный нулевого (нормального) габарита Romanized:kuzov universal'nyy nulevogo (normal'nogo) gabarita (English:universal body of zero [standard] dimension).
The KUNG is a Soviet, then Russian, term for a standardized military vehicle module/trailer system.
[1] The most widespread standard frame-metal body-van is assembled from steel angles and angle bars, steering aluminum sheets outside, but inside - impregnated varnished plywood.
KUNG body type: wood and metal, insulated, sealed, heated and are designed for placement of personnel, repair shops, electronic systems, health centers, etc.
Also the term kung is used informally for an accessory for civilian vehicles, pickup trucks - a metal or fiberglass roof on the body.