I bought some wing-mirror extensions for legal towing of my caravan- these are required if the caravan is wider than the rear of the vehicle towing it. which is the case with mine.
The set I bought are supposed to fit all car wing-mirrors, but they don’t fit mine- mine are fucking huge.
Duct tape and cable ties isn’t really an elegant solution, so I need to come up with something else. I’ll keep you posted.