Abstract: A traction weight system comprised of a plurality of generally rectangular cast metal plates sized so as to be arranged in a variety of two dimensional arrays to comport with the dimensions of different vehicle cargo compartments, each plate having means to interlock that plate with those adjacent plates along or across their closely confronting edges. The plates may be interlocked by various means, including integral tongue and groove structures formed in each plate, or a series of aligned notches which may receive coupling pins. Each plate preferably has a height dimension substantially less than its width or length dimensions, so that the plates may be arranged across the floor or bed of the cargo compartment without interfering with the normal uses of that cargo compartment for storing or transporting cargo.