Historic link

[Elumia]

http://www.dethleffs.de/2006/de/presse/ ... istory.php

I don't speak German, but some of the picture may offer someone an inspiration

[angib]

That early lift-up roof trailer is probably one of the most aerodynamic trailer shapes I've seen, at least in side view:
- a decent radius on the front edge;
- a gentle slope downwards from the maximum height;
- a chopped-off tail.

Andrew

[Elumia]

the pop up is kinda cool too. Also seems pretty straightforward. With a little clever design it could be designed as an "upstairs" bunk for the little ones in a small travel trailer design.