Interior size

I think I know the answer, but just wanted to make sure. On the North Trail 22FBS, the 22 stands for the size of interior living space, right? The actual length, 29' 7" refers to the length from the tongue to the end of unit with retractable bumper extended all the way out?

YEP, you got it.

Model #s may or may not have any meaning with respect to actual size.