towbar

...and if so, what sort of a job was it? Do they have CAN electrical systems that need a special interface box?

Hi All. Does anybody know anything about towbar wiring? Owing to the recent writing-off of Mrs. Avocet's Nissan X-Trail, we no longer have a tow car in the family, so I'm about to try and stick on on my beloved Alfa 164. This is a 1989 ca, so "CAN" isn't really a problem, but it does have a...