The upcoming availability of small European semi-integrated style designs such as Advanced RV's B-Box, Winnebago's EKKO, and Hymer's ML-T strengthens the argument for some distinct classification, whether B+, C minus, whatever, for these units.
In size these are similar to Class B's, and even a bit shorter than the longer Sprinter based vans. For example the Hymer MLT 560, 570 and 580 are all less than 23 ft length, and 560 exceeds the 22ft mark by just an inch. In width they're similar to many Class B's with running boards. And lacking the overcab extensions of American Class C's their overall height stays under 10ft, again similar to many Class B units.
Technology on the semi-integrated units also tends towards Class B standards rather than C, with compressor refrigerators instead of 3-way absorption, all weather insulation, and quiet efficient heater/boiler systems from Truma, Alde, or Espar instead of traditional Suburban/Atwood RV appliances.
Europeans separate their cutaway chassis RVs into Alcove designs with overcabs similar to American Class C's and semi-integrated or low-profile designs similar in size to Class B's. It would be nice if we had a similar niche for these distinctive units.