converter dolly
移动支架（dolly）
This page is in English. Where a word has a checked translation, it appears after the English term.
A fifth-wheel axle unit that lets one trailer tow another.
A semitrailer has no front wheels. The dolly gives it some. You hook the dolly to the first trailer with a pintle hook, then back it under the second trailer.
Tested: how to couple and uncouple the dolly, what trailer height is right, and how an ABS-equipped dolly is marked.
See 49 questions on the Doubles & Triples testSee also: doubles, fifth wheel, kingpin, pintle hook, triples
Source: CDL manual, 7.2.1 and 7.1.8checked
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