Yes
A wrecker is considered to be an emergency vehicle when it's emergency lights are flashing. Under normal circumstances a wreckers lights are not flashing it is just a truck or service vehicle.
If you're ever stopped by Officer Dillon of the San Jose Police Department, failing to yield to an emergency vehicle is a punishment he metes out for "not showing the proper amount of deference" when answering his questions. For the rest of the rational law enforcement community, it consists of failing to pull to the side of the road when a police car, fire truck, ambulance or other emergency vehicle flashes its lights and turns on its siren.
I doubt that would be considered one in any state
An emergency vehicle is any vehicle that is authorized to respond to an emergency. Most emergency response vehicles are easy to see and hear because they are fitted with visual and audible warning devices.
Grant the emergency vehicle the right of way.
Strobe lights are not legal on any non emergency response vehicle. Breaking this law is considered a felony in some places.
Yes if you are just following it to see where it is going. It is however not illegal to be going in the same direction as an emergency vehicle as long as you stay 500 feet back. If the emergency vehicle is not using its emergency lights or sirens, and is not stopped at an emergency scene, you can treat it like a regular vehicle and follow it as would be legal for any other vehicle.
when an emergency vehicle is answering a call, you must stay at least 500 ft. away from the vehicle.
While remaining cognizant of your own and others safety, if possible make sure that there is a path for the emergency vehicle to proceed.
Failing to provide proof of financial responsibility when operating a vehicle
That is correct, when you've pulled over for an emergency vehicle, you wait until it passes, then you can resume driving.
A tow truck is an emergency response vehcile for accident scenes and any police scene it is at. A tow truck is not classed as an emergency vehicle in the UK.