Mike, my apologies if you are aware of the fact that catalytic heaters deplete the oxygen in the trailer. Then, when the oxygen is depleted, the combustion products will include carbon monoxide, a colorless and odorless killer. Long term memebers of this forum may recall that I once walked into a room on Christmas Eve and found a mother and daughter dead in their chairs, watching TV. The furnace flue was leaking.
If you type "catalytic monoxide" into the search box above you will get 14 threads to study.
I would recommend adequate ventilation and a good carbon monoxide detector. I would also never allow anyone to sleep while a catalytic heater was running.
Perhaps I am, understandably, a little paranoid about carbon monoxide.
Nick Crowhurst, Excella 25 1988, Dodge Ram 2500 Cummins Diesel. England in summer, USA in winter.
"The price of freedom is eternal maintenance."