In the case of CO false alarms, they can be triggered by humidity. I'd temporarily hang one of these in a different location for safety. Electric Carbon Monoxide Warning Detection Alarm Co Sensor with LCD Display | eBay
For $13.25 it would give peace of mind and a PPM readout of actual CO level.
LP detectors can be set off by cleaning fluids, gasoline, and many other chemicals besides Liquid Petroleum. Very likely it is the outgassing of carpet glue or underlayment fumes. Put a small fan on the floor to help hasten dispersal of the fumes, perhaps relocate LP detector temporarily in a location away from carpet and a little higher from floor. (Don't place too high on the wall, in the case of an actual leak your RV would have to fill with gas to that level before a warning, making a very dangerous situation)