Lots of good replies thanks.
I am not interested in a generator.
I am going to add solar soon so I am looking at options on heating from that viewpoint.
I like the vented Cat heater option and I do have a great place to install one in the main space of my trailer.
Regardless of the testimonies of those that use unvented cat heaters I wont go that way. My lovely has a bit of a compromised respiratory system and I wont chance it. If it works for you great.
Mr Wizard I know that solar does not produce heat for my trailer but it would give me 12 volt battery storage to run heat sources, that was what my question was about.
jesseannie