In my opinion, the generator exhaust stack should be mandatory anytime RVs are parked in close proximity as at rallies. I use mine but all the diesels around me choke me out. At least there should be a stacks only area I could park at.
The problem with CO is that it kills without warning. Your body does not react to CO and it continues to build up replacing the oxygen in your blood without any warning until it kills you. With CO2, your body reacts - you start breathing rapidly trying to get more oxygen in your blood and you know somethings wrong.
The Dangers of Carbon Monoxide - the Silent Killer