Here's an update for ya, you really don't need to "Sneak Up" on the air in the front of the trailer, you don't want to exceed 10° in the rear diffuser area, The trailer wheel needs to be better centered for tongue weight and over all structural strength. I'm at 6'8" or so trailer height cause your floor and roof have thickness and you don't want to be less than 6' tall inside.
I think this is more livable and more efficient aero wise.
Bigger Version