Thank You,
I do not have a special sleeping bag but am considering 12V heating blanket for the next trip. The trick for us was to heat up the tent (coleman blackcat ) before going in the sack, and sleep with our thermo-clothes on. I cant say we were extremely comfortable, but it was fine.
As for the MTR's, Once I lowered them to 7 psi I was extremely pleased with the snow performance. Had absolutely no issues on uphills towing my trailer behind. But the trick is 7psi. Huge difference from normal offroad 15psi.