My question is whether Dynamic Worldwide is what remained, in essence, of the Gambino trucking empire after it was broken-up pursuant to the 1992 plea agreement.

Or are there several other large trucking firms in which the Gambino's retain an interest?

See this NY Times article for the background = http://www.nytimes.com/1992/07/26/magazine/when-the-mob-delivered-the-goods.html?pagewanted=1