ATM Upgrades

See how we certified a caravan ATM upgrade to 4,500kg, re-rating chassis and axle capacity for batteries, water, solar and touring gear.

Aggregate Trailer Mass (ATM) is the maximum weight your caravan or trailer is allowed to be — fully loaded, on its own, disconnected from the tow vehicle — as set by the manufacturer.

When it comes to towing trailers or caravans, understanding the terms GVM and ATM is essential for safety, legal compliance, and vehicle performance. This guide breaks down the key differences between GVM and ATM, helping you make informed decisions when loading, towing, or modifying your vehicle and trailer.