I wouldn't do any cold winter camping, in any FR product. They don't make any true 4-season RVs, just 3-season at best.
ESPECIALLY an ultralight like the Nano.
Dan-Retired California Firefighter/EMT
and Zoe the Wonder Dog(R.I.P.)
2016 PrimeTime TracerAIR 255, pushing a 2014 Ford F150 SCREW XTR 4x4 3.5 Ecoboost w/Max Tow Package
4pt Equal-i-zer WDH and 1828lbs of payload capacity