I have never driven one of those “roach coaches”, so I don’t know how bad the view is from in the drivers seat of one. I am giving the other driver the benefit of the doubt, I was hard to see.
I didn’t start cleaning out my shorts until after the car came to a stop. 
The truck pressed against my driver-side (left) rear panel. This caused my car to start slewing (yawing?) counter-clockwise. I instinctively turned the steering wheel to the right (clockwise) to “counteract” the yaw. After the truck “released” me, I went into a clockwise spin. (One 360, then a 270)
During the spin, the tires were gripping/being gripped by the road, so much so that I could not budge the steering wheel. I was originally headed northbound on the freeway. I don’t know how far north I traveled while spinning, but when the car stopped spinning, I shot forwards (westwards) across three lanes, bouncing off the concrete median barrier, and coming to rest in the number two lane.
I did not think to depress the clutch until I started shooting forward/west.
I struck one other car, and another car struck me (after the spinning was done), to make it a four car accident. (Well, 1 truck, 3 cars.)
I suppose in my case that if I was also the target of a cop chase, the police would have had my car surrounded faster than I could have regained control of it. I think most (non stunt) drivers, when things are spiralling [sic] out of control, instinctively we slow down, or stop, in order to try and regain control. That last is my guess only, though.