Semitrailer, van, cargo, 12-ton, 4-wheel, M128A1-C. C. Semitrailer, Van, Supply, M129A1C andventilation and light. The sides and roof are in-M129A2C (fig 2-3). The 12-ton, M129-seriessulated to protect the interior of the semitrailer semitrailer, van, supply, is designed for use as aagainst heat or cold. supply van and has seven windows to ...