Good idea or crazy for cold weather

Been thinking about camping in the Pod 172 is some cold weather.  By cold, I mean maybe low of 25ish at night and warming up to above freezing in day maybe to mid to late 50's.  To protect my tanks does the following make sense:  For the gray and black water tanks, add antifreeze in an adequate amount to protect contents from freezing.  And now for the real crazy part:  Construct a collapsable, fold away shroud, maybe from light plywood with 4 sides that I could place around the water tank where one edge of the plywood would rest on the ground and the other edge would go up and be just an inch or so from the bottom of the pod, thus surrounding the fresh water tank.  Then, place either a light bulb or a very small fan heater inside the box to keep the fresh water tank from freezing.  Am I crazy or what?  Inside, I would take the cover off the storage area where the hot water heater and furnace are located to let some heat into that area for the water pipes. And I would leave the bathroom door open for the shower hose and the cabinet doors open for the sink.  Inside, I would probably use an electric heater with a fan for most of the heat and maybe supplemented by the propane furnace if needed.  If in a campground, I would use the electric hook ups provided for electrical power.  If boon docking, I have 2 honda 2000 generators that i can use separately, or companion them for 4000 watts. Also probably need to crack a window a couple of inches for condensation problem.  Any suggestions, advice, please chime in.  Really like the cool weather for camping more than the hot summer heat.

I like the idea of the Ultraheat heaters, but with the temps PodderFJ is talking about, the most I'd do is open the kick panels in front to the water pump and maybe the water heater. I've camped with overnight temps into the low 20s and never had a problem.  Colder than that, and it would be a good idea to be prepared to winterize in situ.  It only take 5 or 10 minutes and a gallon or two of antifreeze, which is always good to carry when winter camping.

TT

If you're really talking 15F for one night followed by 50F the FW tank will  not freeze if it's full. The supply line from the FW tank to the pump is vulnerable and should be insulated. The waste tanks, especially the black tank, will also be OK without antifreeze. As long as the exposure to subfreezing temps is just a few hours you'll be OK. If you elect to use tank heaters, be aware they suck tremendous energy. When plugged in to 120V you'll be OK, but the smallest pad draws 4.1A at 13.5V. The recommended size for 40 gallon tanks draws 9.9A at 13.5V. Unless you specially wire your TV and trailer that pretty well precludes operating them while driving.

Inside, if you're warm the water system is too.However, aiding air circulation never hurts.

Techntrek is probably the best authority on cold weather camping. He's crazy and does it once a year 

How about a 5th or two of Vodka or Gin with a twist as an antifreeze?

Now if you're really into cold weather camping this guy has the answer

http://www.trailerlife.com/rv-trailer-news/braving-the-yukon/

Doug, Take note!