Camping at 27 degrees.

We have ducted heat,2 furnaces,with supposed basement heat so say's owners manual. I am going to disconnect from shore water and just use fresh tank,keep heat on 70,leave luggage lights on (1156) in wet storage,leave gray water open as always & empty black then shut and add antifreeze.Should that be good enough ?

My $0.02 is that will work, but it's WAY overkill. I'm basing my advice on what I do with our 36' Class A. You'll waste a ton of propane keeping the inside at 70*F. If you have electricity and electric heat as an option, I would use that, and only to keep it comfortable in your bedroom and bathroom overnight. During the day, you can put the furnace on to take the chill off, then use electric heaters during the day.

Disconnecting from shore water is a good idea. The fresh water tank will take A LONG time to freeze and won't do it at all at the temps you mentioned.

The 1156 luggage light bulbs do not put out enough heat to make any difference. IF you were going to be in colder temps (25*F or lower for 8 hours or more) I'd recommend a small 150W portable electric heater to put in the bay with the water pump. That'll keep things flowing down into the low 20's, and probably into the high to mid teens.

I NEVER leave my gray tank open. I think that's a bad practice as your rig now becomes a sewer vent for the campground septic/sewer system. But in cold weather, the gray water that flows into the drain hose will freeze. Plastic gets brittle as it is in cold temps, let alone having ice in it. If you go to move it with ice in it, you probably run a high risk of the hose cracking. Like someone else said, keep the drain hose in a bin, protected from the elements and ice.

I'd only dump the gray or black tanks when they need it. Let them fill until it's convenient to dump them. Convenient based upon your schedule and above freezing weather. The MORE liquid you have in the tank, the LONGER it will take to freeze the liquid in them at any given temperature.

Antifreeze won't be needed at all. UNLESS you're talking about winterizing the rig at the end of the camping trip. But I wouldn't add it in until you put the RV to bed for the winter. If you put the antifreeze in the traps before you leave, it might slosh out of the P-traps while you travel.

We've camped in our rig down into the single digits. For that, we went through about 20 lbs. of propane in less than 24 hours AND we used 3 electric heaters, 2 inside and 2 small (150W) outside (one in the bay with the water pump, one in a bay near the water tank). We were nice and cozy, the kids were comfy. The water kept flowing. But that was COLD for us, though I know there are those on here that have braved even lower temps.

Have fun & Good Luck,

~Rick