[High5er]

When we started full timing we did a lot of research and there are a lot of strategies to combat extreme cold/heat.

I don't have the model you're considering, but generally you'll be looking at insulating windows or reflecting the sun away from them, adding rugs, using space heaters to supplement heat where needed and possibly using portable AC units if you can't keep it cool enough. We get down into the single digits in the winter and use space heaters to help in the cold spots. Every year we replace them just as a safety precaution. Our overall length is just over 42' and two $40 Honeywell ceramic heaters are plenty.

The best advice I can give you is to choose the RV you want to live in, then deal with the shortcomings as you discover them. Full timers are battling the elements whether they have a Grand Design, Jayco, Montana or anything else.