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Years ago I asked a Keystone person that. When he got back to me after talking to an engineer he said it's an estimate based on the frame length plus whatever they add to it. The operative word is "estimate."
I have a 50' tape measure. The specs for ours says 38' 4". The tape measure says 39' 1". So I go by the latter. We measured from the forward-most point to the rear-most point, which was the ladder. I vertically leveled a board against each end and marked those points on the ground, then measured between marks. I needed to know because that's how much room we need in a site in an rv park.
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