| 摘要 |
A substrate upon which an advertising message may be printed is releasably attachable to the side of a truck in a way that prevents the substrate from flapping when the truck is moving at high speeds. The upper and rearward edges of the substrate are retained within rigid frames mounted to the truck and are quickly insertable into or removable from such rigid frames. The forward edge of the substrate is wrapped around the forward corner of the truck trailer so that wind cannot get under the substrate, and a plurality of front-mounted and bottom mounted winches remove slack from the substrate.
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