That reminds me of the R-pod campers which are trying to be teardrops but with full interior height. Some people seem to get no benifit mpg compared to their previous traditional travel trailers. Then R-pod added a spoiler to lessen the slope and I suppose, detach the air. It seemed to help but to me the design doesn't seem worth the loos of room for little to no improvement in mpg.
r-pod Airflow - R-pod Owners Forum - Page 1