RE: CO detector; as the story goes, an RVer returned his new rig to the selling dealer complaining to the service manager that every time the went camping, the CO detector would go off.
The service techs checked the CO detector and could find no problem with it. The service manager asked the customer exactly when the detector would go off. The man thought about it for a few minutes and said it was always on Saturday night about an hour or two after dinner. The service manager asked what they had for dinner those Saturdays and the customer stated, "steak, we always grill a steak on Saturday night when we camp."
The service manager asked what they did right after dinner and he said he threw the steak bone to his black lab and then usually took a walk before he settled down for TV or reading a book. The service manager thought for a minute and asked where the dog's bed was located in the rig. The man replied, "right next to the CO detector, why do you ask?"
I think y'all know the answer here; doggy methane!
Murff