APCs and Armored Car questions

[J6A]

Yes, APCs are AFVs, and therefore create wrecks. If there are 3 wrecks in the assault hex, one would need to be cleared for the other vehicular occupants to move out, unless they are demoralized and must retreat/flee.

Armored cars can have efficient gunnery. They do not contribute an AFV column shift in assaults.

And an APC is unable to clear the wrecks of other APCs (armor factor less than 2).  So, does it get stuck if the hex it is in accumulates 3 wrecks?

As for the armored cars, I should be more specific.  Liberation 1944 says German and British tanks are efficient.  Armored cars seem specifically excluded from Tanks under the definition of terms, as they have the recon symbol.  That's where I got confused.