I don't have any issues with temps...what i do have an issue with is the lack of consideration to detail in insulating TCs even the most expensive. You will find many threads in 'UNIVERSITY" about doing insulation...some extreme measure some very simple and worthwile.
Have fun camping...fro the cold temps use 12v heat blanket to warm bed while driving or running genset and unplug when off grid...it will drain your batteries...but it feels so good to get inot a warm bed right off.
ENJOY and do what you need to to make your expereinces yours!