Truck toolboxes come in two popular styles. The most popular is the crossover box, so named because it fits directly behind the cab and slides snugly over both sides of the truck bed. Crosses over, so to speak. Most truck owners bolt their crossover box in place to prevent hard-working thieves from stealing it. Most crossovers measure roughly 66 inches (167 cm) in length by 20 inches (51 cm) wide, with a depth of 18 inches (46 cm). These dimensions will vary according to the truck model. Crossover boxes come with a single lid or a double lid, for easy access. Tradesmen also like side storage units that fit along the sides of the truck and supplement the crossover box. The nice thing about side units is that they often have handy drawers that let you organize tools and supplies into compartments. In addition to crossovers and side units, there are trailer boxes, which sits at the rear of the truck; and the hitch box, which attaches to the rear of the truck at (Where else?) the hitch.