even a slope front, or a v front, still pulls like a barn door when you get it sized large enough to put a car/truck in.
gimme a truck on a gooseneck anyday to a car/truck in a enclosed.
exactly my camper gets roughly 11 mpg average towing
When Haller and I used to stack 2 trucks on one goose we got around 9.5 to 10 mpg and we were about 12,000 lbs heavier