Damn dude, sorry to read this, I think if they towed it with two wheels on the ground it would defenatly break the vc and center diff. Whats even worse is that the car would have given them plenty of warning before it broke. What happens is that while the rear wheels turn it tries to turn the front wheels and not being able to do so would cause the car to hop skip and jump around on the road ultimatly causing drag on the truck. There is no way for a tow truck driver to not know that something is wrong. So if your car is broken, it was done intentionally through the tow truck driver not caring.