BTW, just a side note, I have been looking into this myself, looks like the ones with no wood in the build are much lighter, they use modern composites and all aluminum frames, there is more than one company selling them, example: http://www.livinlite.com/6_8-overview.php
I already decided that you get more room and bang for your buck with a Travel Trailer, I really like the design of this one, BUT will need to win the lotto first : https://www.livinlite.com/camplite21bhs-overview.php