|The following is based on information from Van Buren design documents and is not canon.|
These guys haven't heard from NCR. If you tell the leaders in Hoover Dam about them, they'd be happy to start a big resource trade for them, providing food, supplies, and money to the salvagers. In return, the salvagers would send salvaged materials to the NCR.
You could do the same thing with New Canaan.
Character type completion breakdown
DiploBoy - Is best at negotiating stuff to favor one side or the other.
Duplicate the above, but dumb.