"I had a newbie ask me this one day.....and my jaw dropped!"

Dagnabit! I always forget that one.

 

I wish I was a vet. I'm still a rookie, and will be until the day I retire.

 

What about the flywheel?

*edit*
I was in such a hurry to post I just now see that I got beaten to the punch.

 

18 wheel's, steering wheel, fifthwheel, flywheel, one or two more depending on if you have a spare tire rack on the tractor, trailer or both and not to mention if your someone who hauls tires for a living and how many wheel's turning in a driver's head. However that all depend's if one head or both.

 

In Oregon in December, guy driving a truck from Texas with that "new CDL" look pointed at my chain rack and asked, "How do you secure your load with those?"
I drive a reefer.

 

I was driving thru Ontario, CA the other day in the next to the right lane when someone over the CB said, "Hey (company name), why don't you move over?!"
I replied, "I can't"
"Why not?"
"I'm out of blinker fluid. Can't get my signals to work so I can move over."
Long pause...
"OK. I"ll get up behind you and block so you can get over safely"
I won't tell you the company he was driving for, however, they get a lot of crap on this forum and in the truck stops.