I wouldn't own an RV without a Catalytic heater in it.I have two Big Buddy heaters and they work okay but not near as well as the Wave catalytic heaters do.I have used them in motorhomes/pickup campers/trailers and fifth wheels for Idaho weather and boondocking.They are great for when your not hooked up, which I almost never am.
Like a fireplace(A real one) for getting warm in a hurry and warming the hands or feet..I can't say enough good about them for off road camping...My new pickup camper will have one also.
You can mount them which I usually do but in this particular trailer I decided to have it portable on it's legs to put where-ever I want.If your on a budget,the big buddies work but they put off more condensation but they have a fan which comes in handy also..To each there own.
