We were tailgaiting yesterday and my LP gas detector( located in the bedroom) kept going off. I opened all windows and door and turned off the gas and it kept buzzing periodically. What I realized was the two Honda generators I had behind the bus were blowing exhaust fumes into the bus. I shut them down and used the genset on the bus and the lp detector did not go off anymore while we were parked. While I was coming home, the lp detector chirped once and then the carbon monoxide alarm beeped one short time very faint sounding and about one hour later than the lp detector. While I know my original problem was from the hondas(could have been bad and was another sign that I am an idiot sometimes), I am now wondering what systems to check. I know to check the exhaust systems on the generator and the engine but as I sit here and think about it, anything that burns lp also needs to be checked. My question is: What steps do I need to take to make sure my coach is safe from carbon monoxide poisoning?