A big note, you do want to crack a window and the vent but that is only to control moisture.  The propane heater's combustion chamber isn't open to the interior so no worries about carbon monoxide.  It pulls air from outside and exhausts to the outside, completely sealed.

     Near the AK/Canadian border temps were in the -40's*F.  One night we saw -47*F on our temp monitor in our truck.  at these temps if you turn off your truck in 5 min it is cold inside the cab.  Restarting your truck every 1-2 hours is highly recommended unless you want to spend the winter there.

      Later that night when it had warmed up to near -40*F we stopped and fired up the propane heater under the bed for 2 hours.  It got to +24*F and maintained that temp.  So we got back in our truck and went on down the road trying to escape the ice box we were in.

        On another night that was in the high -20's*F we took a sleeping bag and hung it in such a way that it blocked off all the pod except the bed area.            This worked very well- warming the sleeping area in about 10 min.  Of course cracking a window to insure you have no carbon monoxide or dioxide build up is a good idea- just don't open it too much or you'll find yourself back in the ice box! 

     For those foolish enough to attempt winter podding in the far north or who get caught like we did in bitter -cold to the bone- weather, having the furnace under the bed and sectioning off this area can save your frozen tooshes and actually give you a good night's sleep.  When we first bought the pod I thought having the furnace under the bed was a hazardous and not well planned design- but I don't think so anymore.  

+1, one may turn off clockwise while the other is counterclockwise.  So it may have seemed like they weren't turning off while you were really opening one while closing the other.

I have been fooled by the handles in the shower before.  For some reason they seem counter intuitive to me.  

I also want to add that early this year we had a problem with the kitchen faucet which continued to run on the cold water side.  Hubby pulled faucet (relatively easy to do - just hand tightened) and found a piece of construction debris jammed in it which he had to pull out with a pair of pliers.  No problems since and faucet works perfectly.

My Salem only has one valve.  Took me by surprise the first time I winterized it and I ran a test or two to be sure it didn't allow antifreeze into the WH.

+1

Happy Trails......

Another winterization question[s].  If I remove the battery for storage and still keep the trailer plugged in, do the outlets work?

And totally unrelated, has anyone used the plugin mouse/rodent ultrasonic devices and if so do you think they worked?

thanks