Disconnect Power When Using Generator?

TechWriter wrote:
We lost power to all sites in our park today. The park let us run our generators, but said we should disconnect our RVs from the power pedestal first.

Why?

With all the home wiring jobs discussed on RV.net it is a big unknown if all RVs still meet code to isolate the cord.

For a properly wired and maintained RV there is no issue.