I find a lot to like in the Oliver. The double hull fiberglass would be a better insulated trailer, and fiberglass is far easier to maintain and repair than aluminum. I've owned both a Casita as well as a sailing yacht, and prefer fiberglass for strength and durability. Design wise, Airstream could take a lesson from the 23' Oliver in providing both a front generator platform and a rear receiver hitch. Were I buying today, I would likely choose the Oliver over my 23' Airstream.
Joe & Joan Donnaway