Abstract: A modular system for forming a sign blank includes a plurality of midpanels preferably formed from resin reinforced with fiberglass. Each of the plurality of midpanels includes a face portion having a sign side and a back side and a key end opposite a channel end. A male key extends beyond the key end at the back side, and a female channel is located at the back side of the face portion, at the channel end such that two of the plurality of midpanels may be joined by interlocking the male key of one such midpanel with the female channel of another such midpanel.

Abstract: An articulated vehicle for carrying cargo. The vehicle includes a truck in the form of a tractor having a cab mounted on a chassis and supported on small diameter wheels. A first body is releasably, but stationarily, secured to the chassis by an elevatable fifth wheel assembly. A trailer, which is mounted on identical diameter wheels, is connected to the truck body, via a tow bar-pintle hook connection. The connection is located approximately 8 feet (2.44 m) forward of the end of the truck body. The trailer is separated from the truck body by approximately 1 foot (30.5 cm) so that it is enabled to pivot with respect to the truck through a long swing angle to enable the vehicle to safely negotiate corners and curves. The fifth wheel assembly is elevatable to enable the tractor, when the body is removed therefrom, to be used with conventional trailers.

Abstract: A roll-up door assembly for a vehicle body having a roof, a pair of opposed sidewalls and an end wall including an opening into the interior of the body and over which the door assembly is disposed. The door assembly is located externally of the body adjacent the opening and includes a sliding door which is slidable from a stored position above the roof to a pivoted open position wherein the door covers the opening but is pivoted outward from the opening about a pivot axis located adjacent the bottom of the opening. The door is pivotable to a pivoted closed position wherein the door is pivoted toward the opening to fully close the opening. The door is located within fixedly mounted track means when in the stored position. The fixedly mounted track means are mounted externally of the body adjacent the roof and the sidewalls. The door is rolled into pivotable track means when it is in either the pivoted open or pivoted close position.