I can't speak to cold weather camping, but in the hot summer months of the midwest, the AC on the TM (Carrier V model) was more than enough to keep the interior nice and chilly. Max setting was too much, even in 95 degree heat and 95% humidity -- we kept the unit on normal cool, with the dial at 50-75% cool. The only time there was any (minor) issue was if I closed the privacy curtain to the rear of the TM, since that restricts airflow down the hallway. A clip on fan on the bathroom wall and leaving the curtain a little bit open solved that issue completely.
So, if you keep the curtain open, the back part gets sufficient airflow. At least in a 2720
