After having both a 16' Scamp then upgrading to a 19' Escape after the Scamp was partially crushed by a fallen 250lb ice laden oak branch (both molded fiberglass) still looking for something environmentally friendly.
Our current 35' MH is very comfortable but huge guilt at dumping so much crap in the air as we travel.
I just saw this (see link). While only a "concept" may be interesting.
https://www.treehugger.com/airstream...5410&utm_term=
Perhaps one of the new Ford 150 like etrucks and an eStream may be another way to go.
The linear living in an Airstream will alter long term travel comfort as we spend 4-4.5 months living in our rig non-stop. No slides for space expansion.
Cheers,
Batdude