If it gets cold enough to start worrying whether the tanks will freeze or not, then the fireplace isn't gonna keep you warm enough anyway. Our fireplace/heater in our Northridge works very well, we do occasionally use the furnace, especially April and October. Our last unit did not have the fireplace, and do notice a huge reduction in propane use with the newer unit.
We also have the electric jacks, and although I have no preference between them or the scissor style, I added Steadyfast stabilizers, made a world of difference. There is probably half a dozen different styles of braces/stab bars on the market, my favorite is Steadyfast, as they're connection points are frame to jack leg. Thus needing only 3 bars instead of six. Simple like me.
2011 Coachmen North Ridge 290RKD 5'er
2005 Dodge quad cab dually diesel 6'spd manual
1 weird cat with an occasional attitude problem.