Good morning -
I changed the model number in your title to avoid confusion. Just FYI, the first 2-digit number is always larger than the second 2-digit number by 7. Hence model number 2518, 2720, 3023, 3124, 3326, etc. It has to do with the open and closed lengths.
With 3 teens, yes, you will need space. When I was that age, my parents moved the sleeping quarters for my brother and me out of the camper and into the back of the HUGE Chevy Suburban tow vehicle. It was well set up with air mattresses, sleeping bags, dry and bug-free, and we enjoyed the privacy. Other camping families set up tents for the same purpose.
As you have heard, TrailManor changed the framing material of the shells from wood to aluminum, making the change over several years from about 2000 to 2003. A unit built within that time span could be either way - you need to check. Note that there is nothing wrong with wood framing in the shells, as long as it is still solid and dry. For 20 years, TM built campers with wooden shell frames, with very few problems. For an older camper you should check for rot, but the important thing is for owners to take note of leaks, and fix them promptly. Wood that sits, saturated, for a long time, will rot. As you would expect, wood that is temporarily wet, but quickly dries, seems to stay in good shape.
FYI, the outer frame of the floor is still wood, but rot seems to be rare in that area.
Good luck in your search.
Bill
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