Towing mirrors provide much-needed visibility to your vehicle example: Holden Colorado towing mirrors, Toyota Landcruiser towing mirrors when carrying an added compartment at the back in the form of a caravan, boat, or something similar. More importantly, towing mirrors are legally required by the Australian Government if you are towing anything wider than your vehicle.
This type of attachment affects your vehicle’s compliance, specifically the Vehicle Standard Australian Design Rule 14/02 – Rear Vision Mirrors 2006 Amendment 1. According to the regulation, if such an attachment, or in this case an addition, is wider than the tow vehicle, towing mirrors are a requirement. This is mainly because a caravan would block your field of vision from your side mirrors.