Because of the volume of gas & heat output. But there again we don’t know the OP’s menu & food output volume. … Also, the range could be ran at less than max. heat output (50% on burners or oven …???) … I’m just questioning the need for such high heat out put.
Another, point for the mobile truck setup is that commercial type ranges have very little (or no ) insulation around the oven when compared to a residential range. So a commercial range will heat the truck kitchen work area more while the residential range may provide the same heat temps with less gas usage and less work area heating. … The above American range requires 12″ clearance (see small print in product info) to combustible walls, cabinets, or materials while a residential range has 0″ clearance requirement. This space is not usually available in a truck & trailer setup.