My friend owns a towing company and he won't do "infraction tows", only lockouts, breakdowns and shit of that nature. He really, really hates cops, has a carry permit for his .45 and they're all fucking terrified of him.
Might be something to do with the fact that he tells them straight up how much he hates their guts, what little faggots they are, basically just heaps abuse on them (I was out snowplowing with him last winter when we rolled up on a cop hassling this kid in the ditch, he pulls over and just lights into this pig, I was like "OMFG, no way").
He's also good about making shit disappear when the cops aren't looking at the scenes of accidents. Shit that would get the involved parties in deeper shit than they already are.
But yeah, other every tow truck company I've met are complete and total pricks.