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The teardrop falls off too fast. Same problem the VW Beetle has. As the curve of the roof surpasses a specific angle (which is endlessly debated here at Ecomodder) the flow separates. Everything abaft of that is 'in a negative pressure regime', IOW being sucked on. Probably just around the middle of the windows.
The taller trailer has a good roofline that the air can follow, and ends at a height not much greater that the max height of the teardop. So the effective hole it leaves for the air to reenter is bigger but differently shaped, lacking the inward-rolling vortexes the teardrop generates.
Construction details and the undercarriage are probably similar given the same manufacturer. It would take tuft testing, wind tunnel or CDF modeling to sort the details.
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