from Las Cruces, New Mexico. Welcome to the Forum.
I do not own a Casita either, but it seems most of the extra foot goes into the area in back, where the bed would be. I know it gives them larger bed sizes as well as different bed arrangements than what we have in the Scamp
Good Luck with your Quest.
2005 16' Scamp
Side Dinette, Front Shower & Head
2009 White Ford F-150 Reg. Cab
Long Bed with A.R.E. Molded Fiberglass