Nah, the bariatric ambulances use the same body, they're just fitted with different stuff inside.
That being said, the only ones I've seen have been the bigger box-style, rather than the narrow van-style that Scottish ambulances tend to be. So there's that.
@i I remember Berlin in particular was a fantastic place to be a child on a bike. We (Health Professionals) are well placed to encourage people to develop healthier, more active lifestyles - there are some initiatives related to this and some very active proponents i.e. Dr Andy Murray.