| 摘要 |
An undercarriage for pivotable supporting the front end of a trailer with the undercarriage including a set of bolsters that provide a pivoting and rockable connection between a box on the trailer and the front undercarriage to reduce stress on the box with the undercarriage including detachable lift members to permit the user to raise the rear wheels of the undercarriage to permit one to back the trailer like a conventional trailer.
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