The m983 is a tractor unit for use with the trailer-mounted mim-104 patriot missile system. It can also be used with the interim stryker recovery system, or other trailers. An earlier variant fitted with a 30 kw generator and crane mounted behind the cab was used to tow the mgm-31 pershing erector launcher in conus. The m983a2/a4 light equipment transporter (let) tractor is mainly used to transport construction and engineer equipment. It has a 45,000 lbs. (20,430 kg) 2 speed hydraulic winch mounted behind the cab used to load the trailer. It does not have a self-recovery winch