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Sorry to be slow to answer. They are just model numbers as per Mike Mack. As far as length is concerned you can't trust the brochure. The length is the amount of overall measure from front most outside to rear most . For instance, my 3900FB measures 41'11 " from the bulge nose to the ladder. Jim Fischer measured the height of most of us at the national rally and most were 13'4". Correct me if I'm wrong, Jim.
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