I have had a Wave3 in my 11.5 Bigfoot TC since about 2005. Last year, I purchased an Alpenlite 19 5th wheel. I figured I could only use the TC or 5th wheel when camping, so I could save some money by moving the Wave3 to which ever unit I was taking camping.
The install in the Alpenlite 19 5th wheel went as expected. We went camping on the coast. I don't recall the temp, but it was not freezing. Early in the AM it was a bit cold with the Wave3 on high. It is obvious to me I need another Wave3 or replace the existing Wave3 with a Wave6.
I will add a second Wave3. With a Wave6 the temp setting would be 3200 to 6000 BTU/hr. With two Wave3 heaters, I would have greater control of the heat range, Adjustable from 1600 to 3000 BTU/hr. With both Wave3 heaters on maximum, I would have 6000 BTU/hr. A bonus is the ability to direct the heaters in different directions.