| 摘要 |
A trailer unit arranged to be coupled to a vehicle including a frame supported on a single wheel with an enclosure on the frame having a floor provided with an opening in which is disposed a pan which may be vertically moved manually between an elevated travel position within the enclosure interior and a lower operative position exteriorly of the enclosure into supported engagement with the ground thereby providing headroom for an individual standing thereon within the enclosure interior together with seals on the frame which may be releasably urged into sealing engagement with the side walls of the pan and a passageway connected between the vehicle and the enclosure for passing therebetween by the individual.
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