Abstract: A removable truck deck for use as part of a roll-off truck deck system. In one embodiment, the removable truck deck comprises a replaceable and interchangeable side fitting that may be locked at a desired position along the length of the removable truck deck. The side fitting may be used to provide a plurality of interchangeable attachments on the truck deck. One such attachment may include a pontoon permitting the truck deck to float when removed from the truck. A plurality of floating truck decks in abutting longitudinal series may be used to create a floating bridge. Other attachments include, wheels, cranes, winches, transverse partitions, tailgates, sidewalls, etc.

Abstract: A rear track suspension for a snowmobile having a single resilient element for biasing both the front and rear arms. The slide rail is permitted to pitch between first and second pitching constraints in response to terrain obstacles in a gradual manner as the motion constraints are approached. This reduces jarring of the rider when the pitching constraints are met. Suspension compression exhibits an initial falling rate motion ratio, followed by a constant rate motion ratio, followed by a rising rate motion ratio. This U-shaped motion ratio profile advantageously provides cushioning upon landing along with a resistance to bottoming out of the suspension upon full compression. The result is an improved ride without sacrificing suspension performance.