Those Leisure Vans are sure pretty - if you happen to be enamored with that Sprinter chassis and can put up with the limited headrooms in their Class B/B+ line.
In addition, note how that all of their models are on smooth riding long wheelbases - which also gives rise to more concern with regards to occasional off-pavement use because of high-centering issues. Add those long wheelbases to the typical low-slung ground clearances (except for maybe the Chevy based model) of the Sprinter chassis and you wind up with pretty much a highway-queen of an RV.
With the possible exception of the Chevy based model, their tank capacities are nothing to write home about, either.
Like most queens - they cost a whole potload of money for the limitations you have to put up with just to get their "beauty".