Welcome to the forum. I agree with others on getting it right the first time on your length. When you sit down it, you will know immediately that it is what you want. My wife and I have the shortest version of the Montana, 2955, which is 33 feet. This unit has a nice floor plan, but is not for 3 people. It is just right for 2 people with a lot of room and is easy to pull, even in the mountains with a 3/4 ton. Our height is 12 ft. 6 in. I have to rent enclosed storage as my shop is only 12 ft. One of my many screw-ups....
I had the shop long before this unit and thought it would fit..... Have fun choosing the one for you and your family. From reading the post and getting ideas, I am sure there is the right Montana to fit your needs....JB