As far as I know they are all the same length, people just measure them different. I have never seen this floor plan either, they usually have captains chairs on the curbside in that model.
This one looks to need quite a bit of cleaning up and is missing the front jacks. I also wonder about the condition of the ceiling since it is not shown.
1979 Boler B1300 | 1987 Bigfoot 5th Wheel | 1988 Bigfoot 5th Wheel | We officially have a collection!