Running generator at night while sleeping?

CO is a product of incomplete combustion. A small amount of CO will be generated by a properly running generator. Some of it will likely seep into your RV. More will seep in if there is more created. This is partly offset by fresh air that slightly pressurizes your RV when the AC is running, assuming the AC draws in fresh air on the roof.

Make sure your genset runs good. Use multiple, newer CO detectors. Follow all the other safety procedures for operating the genset. Use it if you need it and it is allowed.

Personally, I'm more worried about a genset fire than CO.