Earlier quoted context omitted.
AFAIK the European design is made to minimize the length of the truck. There is an EU limit on the total length of the truck and trailer in Europe (default 18.75m, EMS 25.25 etc.).
That reduced length is doubtless a big part of how they seem able operate successfully in the urban fabric. It’d be unthinkable with American-sized trucks and trailers. Tangentially, the smaller ambulances and fire trucks here seem so much more sensible than what you see in America. Generally, I’d remark that many city design problems get easier if you can scale down the problem. In this case, the problem of managing…
Those huge trucks are also all custom built chassis and incredibly expensive.
European fire departments using customized versions of off the shelf commercial vehicles are so much more sensible for urban spaces and don't need to drive transportation decisions.