They really do need a road diet, and part of the way to get there is for a fire truck diet as well, which might need some regulations to be changed, like NFPA (National Fire Protection Association) codes and regulations
Not Just Bikes did a video on this too, titled "How American Fire Departments are Getting People Killed"
Currently they need custom chassis, over-spec'd horsepower, valves, do-everything mission kind of truck, whereas in Europe or Japan or Hong Kong, you'll see standardized, compact, cheaper, safer commercial chassis that still carry the same equipment and equally tall ladders for the job
Some cities, fire departments can also veto street redesigns and developments, because they need to fit their oversized truck in the streets, so to get there, we need to get fire departments on board and gradually replace their fleet as they retire older trucks, as it might be cost prohibitive to do it all at once