the toilet tent was just used for storage - kept the loo firmly inside the van
actually, funny thing was - we were warmer in the bongo with a foot of snow on the ground, than we have been in the house with just a few inches... it's a smaller space to heat, and as the heater is pretty much directly at your feet, we even got too hot from time to time!
the main problem was with sleeping upstairs (we only have the back seats in and no RnR bed so no option with this) - wasn't cold for us, we had good sleeping bags & blankets, but the pillows got very cold/damp - and then the space downstairs was taken over in the day with trying to dry the bedding out/warm it up
