In most cities, the health departments are overworked and underfunded. I haven't been inspected in over a year and I also have a catering truck and they have extended our permit now 2 years without an inspection simply because they don't have the manpower. As an owner I am happy not having to deal with them, even though I run a pretty tight ship and have never had issues, but from the public's viewpoint I'd be pissed.