| 摘要 |
An expandable trailer for transporting and using exercise equipment on the expanded trailer platform, comprising a boxcar shaped trailer mounted on wheels with a hitch for connecting to a motor vehicle. The boxcar walls are hingedly connected to the floor and pivotally open, extending the boxcar platform. Preferred embodiments include truss systems mounted to the platform equipped with cylinder type braces or pulleys that facilitate manually or automatically opening and closing the boxcar walls.
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