[MidMOTraveler]

Welcome to the MOC Forum. Weight and tires are always hot topics.
If I read your post correctly you already have the truck. This puts you in the position to know what you can not tow. Montana’s are heavy and tall and if you’re full time you’ll carry more than a weekend warrior.
A 40’ most likely is out. There are lots of folks out here full time in smaller Montana’s look around and you’ll find you home.