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The smaller trailer is an aero disaster, with flat sides leading to the quick slope of the rear 1/4, it is certainly creating a monstrous pair of twin trailing tornadoes that might as well be drag chutes. The bigger trailer looks about right for good aero design in that it starts the air on a gentle let down without swirling it about.
I always try to point out that we are really driving our vehicles "Through calm air" the air is NOT "blowing over our vehicles". The distinction being that the less we energize the calm air we drive through, then the less energy it takes to move on, that is the real basis for aero efficient design. Leave the air as calm as possible after you pass.
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