US Army, Technical Manual, TM 55-2320-258-14, TRANSPORTABILITY GUIDANCE: HEAVY EQUIPMENT TRANSPORTER, (HET), SY TRUCK TRACTOR: 22 1/2-TON, 8X8, M746, (NSN ... ITEM IS INCLUDED ON EM 0042 & EM 0049),

US Army, Technical Manual, TM 55-2320-258-14, TRANSPORTABILITY GUIDANCE: HEAVY EQUIPMENT TRANSPORTER, (HET), SY TRUCK TRACTOR: 22 1/2-TON, 8X8, M746, (NSN 2320-00-089-7264); HE EQUIPMENT TRANSPORTER (C-HET) SYSTEM TRUCK TRACTOR, COMMERCIAL: GVWR, 8X6, M911 (2320-01-025-3733) AND SEMITRAILER, LOW-BED, HE EQUIPMENT TRANSPORTER, 60-TON, M747 (2330-00-089-7265) (THIS ITEM IS INCLUDED ON EM 0042 & EM 0049),