The M386 was similar to the earlier 762mm truck-mounted rocket launcher M289, but was lighter and boasted a less bulky launching rail. The front of the rail was able to be split and folded to the rear for travel, as illustrated in this image. (Picture from TM 9-500 C3 Data Sheets for Ordnance Type Materiel.)
The front of the launching rail is locked together in this picture, and one of the screw jacks is visible behind the fuel tank on the right running board. (Picture taken 31 Mar 1983; available from the National Archives.)
The launching rail is ready for use, and the screw jacks are lowered, with one at the rear and one on each side. The smaller footprint of the launcher mechanism compared to that used on the M289 is apparent, especially with the launching rail in its traveling configuration. (Picture available from Redstone Arsenal Historical Information.)
The vehicle is seen from the opposite side. The latch for securing the front of the launching rail for travel is visible under the rocket warhead section. (Picture available from Redstone Arsenal Historical Information.)
The launcher is elevated in preparation for firing. The firing section's wind measuring set is deployed in the background. (Picture available from Redstone Arsenal Historical Information.)