| 摘要 |
A grain or silage box is mounted on a trailer frame and kept low to the ground through the addition of a step frame at the forward end of the trailer side frame members. The step frame includes a fifth wheel king pin for engagement with the fifth wheel plate of a semi-tractor. The step frame is hidden between the downwardly extending elongated box frame members when the box is in a lowered position. The box frame members are laterally stabilized by the step frame with the box in its lowered position on top of the trailer side frame members.
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