| 摘要 |
A trailer is self-propelled via a powered tongue jack and includes a lightweight, high-efficiency asphalt heater. The trailer is moved long distances, such as to and from work sites, using a towing vehicle, in conventional fashion. When a t the work site (or storage site), the tongue jack is lowered to support the trail er in a generally horizontal position, and, by virtue of a powered jack wheel, can b e used to position the trailer easily, quietly, and confidently in either the forward or reverse direction.
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