The tow trucking companies are either supporting the protest, those who don't are found out and harassed into inaction. Also, most tow companies make the bulk

The tow trucking companies are either supporting the protest, those who don't are found out and harassed into inaction. Also, most tow companies make the bulk of their revenue by towing large vehicles, so potentially antagonizing the truckers and ending up on some kind of unofficial towing blacklist would hurt them to a point where they'd rather not do anything.