They're beautiful...very much in keeping with the original simplicity and lightness of
fiberglass trailers here in the U.S.A.
I think the love affair with the black tank is a recent North American thing- such extra weight/room/trouble "amenities" are often spurned by European/Australian trailer makers.
I wonder when we became so enamored of carrying around huge quantities of our own waste???
I for one much prefer the ease of the portable toilet/cassette.
Francesca