Jim, you are close. In my experience, bumper to ball is the length of a TT. Model number has little to do with anything. For instance, my 21FBS is 26'6" long and a 22FBS is 29'7" and a 24RBS is 28'8". Not much rhyme or reason that I can see.
Hmmm, I had always assumed that the number had something to do with the living space of the interior because coincidentally, my Edge M21 was about 21 feet end to end inside and my NT 26 LRSS is close to 26 feet inside.
I think to some degree, manufacturers who come out with floorplans that are similar to another brand they compete with, will often times use the same floorplan number. So in those cases, it may help prospects better compare across manufacturers. I know this is a small number but it happens.
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