I am assuming that when you say catalytic heater, you mean it is propane fuelled. You need to be able to deal with, and get rid of, the moisture that will be produced as a byproduct of combustion, and the awful smell (in my opinion) that comes from using one of those inside. I hated using the furnace on my trailer, used TOO much power, and way too noisey. A little high on the price scale, but I installed an Espar heater in my trailer, run it on kerosene (no smell, the combustion intake and exhaust are outside the trailer), and very low power draw, perfect for dry camping, which is all we do. One extra nice benefit I've found with this heater, is that the heat is actually a "dry" heat, and it helps to get rid of moisture in the trailer.
Tow Vehicle: '92 F350, Crew Cab, 4X4, Cummins 5.9 24 Valve, 6spd.Driver:Clint, Navigator:Melanie, 1 dog (Great Pyrenees/Akbash cross) and now a cat too. Mission Statement: Just another adventure! Towed vehicle:2009 Roo 19 with lots of mods!