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RV Trailer improvements?

A pusher trailer.

Quote:

This aero setup helps with the trailer’s other headlining feature, its drive system. Located under the sleek body is a self-propulsion system. An electric powertrain is found underneath the camper which houses an electric motor and a 80 kWh battery.
....
If that sounds awfully familiar, it’s because this concept is currently being worked on by Airstream and Dethleffs. Both companies have taken camper designs, outfitted them with self-propelled EV gear with 80-kWh, and are marketing their campers as having similar benefits.

Lightship noodling

Since Lightship is 'aerodynamic', I did a link to it at the Aerodynamics Forum, and went ahead with a preliminary estimation of it's particulars.
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Lightship has also left the door open to anyone who might 'lose' the TV, and loft the roof to create a 'motorhome' with the vestigial boat-tail.
Adding a boat-tailed 'trailer' to the 'motorhome' would allow for super pressure recovery for the new combination, ratcheting up savings to an even higher level.
This would be single-frontal area combination, 'single-hump' aero singularity, which could chase the Cd 0.12 of Walter Lay, of 1933, of which Lightship shares in similarity.