Earlier quoted context omitted.
I'd be pissed to be his neighbor. The firetruck spews dirty exhaust, is unsafe if there are kids running around, and definitely is an eyesore. Even though there's no HOA he is probably running afoul of city or county zoning rules...you shouldn't be able to park large work trucks in residential neighborhoods.
What makes the truck more unsafe around children than e.g. a Ford Explorer or similar?
It also would have far worse visibility than a Ford Explorer.
That said, I don't think it is an argument for whether he should be "allowed" to have the truck or not. If there was evidence that people with large truck always hurt kids, perhaps; but I don't think that evidence exists.