Gene, I measured it empty except for a full tank of gas. Since we park in the back yard its easy to empty almost every thing out for cleaning when we get home. Unloaded it is 9' 10". I am begining to think perhaps most RVs are not carbon copies as an automobile might be. With all the suppliers in the northern IN area perhaps if the builders run out of one componet they just go down the street to another vendor. Since the suppliers build componets to common size, say 14 x 14 vent opening or 10' awning lenght, any part will fit the RV rough opening but maybe be larger or smaller in cube size. Just a guess.
Chas, I remember that underpass also but luckily I was in my SUV after visiting a friend in CCU at the UVA hospital a couple of years ago. Maybe the Yankees built it down here after The War Between the States to punish southern RV drivers.