Training Manual TM 4-48.13 TO 13C7-3-51 Airdrop of Supplies and Equipment: Rigging Trailers March 2016 TM 4-48.13/TO 13C7-3-51 provides operational information on the preparation and rigging of the M101, M101A1, M101A2, M1101 3/4-ton trailer, the 1 1/2-ton trailer, the 400 gallon capacity water trailer, the 15-ton tilt bed trailer, the 1 1/2-ton ammunition trailer, mine-clearing line charge (MICLIC) on a 2 1/2-ton trailer, the Ingersol-Rand model 250 CFM trailer mounted air compressor, and the trailer-mounted engineer electrical tool outfit which are rigged for low-velocity airdrop from a C-130 and C-17 aircraft