[aerohead]

Originally Posted by kach22i

See the attached rough concept.

If this is for an RV, have you studied or given thought to gutting the raised floor system?

I'm not sure how all the working parts are organized under there besides dedicated luggage areas between the wheelbase, but it seems lowering the floor could be just as labor intensive as raising the roof, plus the "A" in CdA is the same or lower should you taper off the back as shown in concept sketch.

In between the wheels the lower half of the coach interior would be "U-shaped" in cross section but the rest of the time it should just be a rectangle.

Don't think of this as removing the floor, think of it as lowering the floor.

I'm guessing that you are running electrical and plumbing under there for your new layout, leave a service utility cavity but instead of 36" make it 12".

Drive shaft and exhaust pan tunnel raises will be the immovable fixtures to work around.

The rough concept is NASA-esque. The air would like that.