Their rules state the following exclusion: Service to unattended vehicles unless pre-authorized by CAA
So there may be a way to get the tow authorized ahead of time. Your friend would have to call them and weave a story.
I have had my (fulling operating) bike towed from my house to the dealer for service and had it towed back (without me being there) with CAA without problem.
I requested the service thru the web, so they had my membership info already and they never check my card. I guess that's like pre-authorizing. Seems like as long as there is someone there to acknowledge the tow (or help with loading) you are good to go.
Sent from my ASUS_Z00TD using Tapatalk