We recently bought a 2006 PW Lexor ( cap on Chevy body).
Essentially not intended for cold weather camping- the determiner is more the water/tank systems than comfort.
Although I think that with PW and RT both Canadian, the value of insulation is considered.
A "more Southern" manufacturer just wouldn;t have that DNA
Last week's trial run to Northern AZ saw overnight lows of mid 20's. We were on shore power and used a small ceramic heater ( set on low and about 1/2 way) to warm the coach.
I had a sleeping bag up against the rear doors and windows as could feel the cold coming through, and a spare blanket against the wall by the single pane window
I was pretty comfy all night wearing longjohns.
Dog helped.
Mike