Originally Posted by tmorris
The escape is probably the most streamlined unit available.
While Escape bodies are more rounded on the front than typical "box" RVs, I don't see any objective reason to believe that they are more streamlined (have lower aerodynamic drag) than a typical trailer (many of which have moulded fiberglass nose cones), let alone most trailers. The rounded rear corners are bad for aero, the overall shape doesn't have favourable characteristics (such as tapering slightly toward the tail), and the bottom does not have a smooth flush cover. The good feature is the rounded front corners, like all of the Trillium derivatives and less rounded than all of the Boler derivatives.
Perhaps the most frequently cited "low drag" trailer has been Airstream, which has a more rounded front than an Escape (how rounded depends on the vintage) and a flush bottom... but unfortunately a rounded tail as well.
Objective data about travel trailer aero drag is notably lacking, possibly because it depends so much on the tow vehicle, and no one has enough incentive to test a wide range of combinations.