Abstract: A tie-down rail adapted to fit the top ledge of the sidewall of a truck bed, the tie-down rail comprising an elongated tubular rail having a substantially circular cross-section, and a hollow interior. In the preferred embodiment, the rail includes a planar top surface. Alternatively, the top surface may be slightly arched. The rail comprises open ends extending angularly downward and adapted to rest on the ledge of the sidewall. The preferred embodiment includes a pair of oppositely disposed flanges positioned in a plane parallel to the top surface of the rail. A rib projects into the interior of the rail from a bottom inner surface of the rail along a centerline. The rail further includes a bracket configured to be received within the end of the rail for attaching the rail to the ledge. The rail may also include a plurality of spaced apart slots formed along at least one side surface of the rail.

Abstract: A system for improving the power of vehicle wheels on a support, e.g. a winter slippery surface, has nozzles near the wheels supplied with a sticky or tacky liquid from a container under the control of the driver. The container is connected with a doser and with a source of compressed air, e.g. compressor, which is used for both application of the liquid to the wheels and cleaning the nozzles. The system includes a dosing reservoir and a three-way valve, the container being connected with a first branch of the valve, the dosing reservoir being connected with a second branch of the valve, nozzles being connected with the third branch of the valve. A first conduit extends from the compressor to the reservoir for application of the liquid and a second conduit extends from the compressor to the nozzles for cleaning the same. Alternatively, dosing may be carried out by the aid of time controlled dosing directly from the container and time controlled supply of compressed air to the nozzles.