When we were at the Hershey show earlier this year, both Lorraine and I noticed that most of the RV manufacturers were really close in terms of their basic design. This was especially true for the 5th wheel and trailer models with the exception of the Airstream products.
That said, there are some very interesting RV designs out there.
Case in point, the Mehrzeller – the multicellular caravan.
Not sure that it would be my first choice but it is a very unique design. You can find out more about them here.