When I have had to use AAA, the radios belong to the actual tow company and not AAA it's self. I would suggest finding what frequencies the tow companies use that contract for the service and go from there. If you live in a major metropolitan area as I do, there are many companies that contract with AAA. Different companies for different areas. I don't know if AAA operates their own service vehicles. If they do then the FCC files would be a place to start.
As stated above, they also use MDT's & tablets for the details of a call. Only the basic of information and general conversation are heard on the air anymore, no address's or names to prevent pirates from jumping on the calls.