N.J. Stat. Ann. § 39:3-84.13

8. A towing company operating a light-medium duty tow truck without displaying a proper marker or valid tow truck license plate as required by this act or violating section 6 of this act shall be subject to a fine of $600 for the first offense and a fine of $900 for each subsequent offense and a towing company operating a heavy-duty tow truck without displaying a proper marker or valid tow truck license plate as required by this act or violating section 6 of this act shall be subject to a fine of $1,200 for the first offense and a fine of $1,800 for each subsequent offense. A person or towing company knowingly displaying a false tow truck marker or license plate or using fraud or deception in securing tow truck registration under this act shall be subject to a fine of not less than $1,000 nor more than $7,500.