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I was told by Keystone that the model is based on the inside space, from the back wall to the inside front wall. For example, we have a 2013 3100RL and the inside space is supposed to measure 31" from inside wall to inside wall. The spec sheet measurement is from the back corner OUTSIDE frame to the front of the cap. Our spec says 35'9". However, when we measure from the back of the ladder to the very front of the hitch we get 36'5". That is the measurement we use for choosing a campsite, in fact we say 38' just to make sure we have plenty of room. So quite frankly I think the best measurement is the one you take yourself from whatever point matters to you! For our concrete pad we measured from back of ladder to front of pin. Hope that helps! Congrats on the new house!
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