| 摘要 |
A truck has an extendable and retractable truck bed for receiving removable and replacing truck boxes of different lengths. The truck bed can be extended or retracted to fit the size of the truck box. The truck bed has movable supports that can be extended or retracted from inside or outside a cab to support the appropriate length of the truck box. The movable supports also act as guide means to guide the truck box onto or off of the truck bed. In a method of extending or retracting the truck bed, a single truck can be used to mount or remove truck boxes of different sizes.
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