A couple things that don't add up regardless of how the story unfolds. Picture this:
You tow my car a few blocks away.
I find my car after you lower it and leave it sitting there.
I get in my car, start it and put it in drive.
I see you standing in front of me at some point and decide to run you over.
You shoot and kill me with a single shot.
First. Let's assume you are not near my vehicle when I find it. So, there's no arguing and no scuffle. I start it and start to drive off.
Are you standing there in front of me with a gun already drawn? Sure I'm going to steer toward you because I feel I'm defending myself now... I mean are you drawing a weapon on me with the possibility of killing me over a towing fine for my car? I mean I'm not stealing anything by the fine and you have my plate so you know who I am and can call the authorities.
Did you hear my car start and come running out of a shack/building/from around a corner? I decide to try to run you down, just because. You're standing right there after all and I'm pissed. So you have time to pull out a pistol from a shoulder harness, belt holster (or just tucked in to your belt), or some other area... draw on me, get a good single shot, and still avoid the car that was heading in your direction (I mean I didn't hit the brakes just because you shot and killed me)... however you didn't use all that time spent killing me (defending? yourself) to just get out of the way?
You're not going to die by getting "hit by a car" unless the car has at least a few car lengths or more to travel before hitting you. I mean, it's got to have some speed... so you're 20+ feet away from a car that was just started and the pedal mashed. Unless my car is all muscle 20+ feet doesn't give me room to get up the speed required to actually hit you before you can get out of the way, especially if you had time to draw and fire your weapon. Hide behind a building or another car in the yard.
Now, let's assume you're right there when I take my car. We've probably had words. We're both pissed. Who knows, maybe I'm drunk too. Problem is, are you standing 5 feet in front of my car as I try to pull away? Are you licensed to carry a concealed fire arm or did you brandish it (premeditated if you did brandish it not reactionary by the way - what are the gun laws in Florida?)? In 5 feet will my car be going fast enough that you couldn't have gotten out of the way or jumped up onto the hood at worse case? So shooting at a moving car that still didn't stop and still didn't hit you was the only course of action?
Then there are the subtlties...
Were there burn marks on the pavement (if it was gravel, how could I achieve a hard launch)?
Where was I shot? The back of the head? The chest? The forehead? The side of the head?
Where did the car come to rest?
Where did you get the firearm? What type and caliber of firearm was it?
I see a much darker truth than what the media (and this driver) are reporting thus far. I just don't see how he can claim his life was truly threatened and he had sufficient reason to react the way he did. I'll fall back on the two variables that keep coming back to the defense of the driver regardless of the driver's intent. If the trucker had time to draw and shoot, he had time to get out of the way. If the trucker shot the driver, the car wouldn't have stopped instantly, which proves the trucker could have simple moved out of the way.
I'm just one guy typing...