Have you ever used a euro-RV?
Low ceilings, narrow, no slides, no air/con, cassette toilet, etc...
White or other light color interiors to help show dirt when the kids come in from playing in the mud.
They serve their purpose in Europe where tow vehicles have much lower tow ratings, power is 3 times the price and campground sites are a fraction of the size of American ones.
Style is subjective. The average buyer particularly among bigger units are older and more conservative, so they probably aren't interested in the modern look.
You might try something like the rpod for a similar look.
