The OEM unit in the Solera is a combination CO and Propane detector. For those who are going to replace the OEM unit, they DO NEED TO have BOTH CO and Propane detector units.
We were camped in Parsippany NJ back in late '80s. We had been into NYC as tourists, and returned to eat a late meal in the camper. Suddenly... BOOM! A beautiful Country Coach parked next to us blew up.
The Roof went skyward, and the walls simply folded out... all the cabinetry on the floor was still in place. I ran out with my fire extinguisher as the occupant was walking around with his underwear and socks on fire. We got him out onto a blanket and someone asked him what happened - he replied he couldn't sleep, so got up and decided to light a cigarette. We found out he died about a week later with 3rd degree burns all over his body.
Lesson learned about detectors: I'll ALWAYS have a functioning one!