Are vehicle manufacturers pulling the wool over our eyes in the legal department of braked towing?

With the proliferation of vehicles rated to 3,500kg of braked towing over recent years, are vehicle manufacturers playing smoke and mirrors with their published braked towing capacity?

Generally it’s the 4X4 vehicles and in particular the 4X4 utes and dual cab utes which are most commonly awarded this esteemed badge, effectively creating the perception that you are able in fact, to tow a 3,500kg caravan.

So we’ve decided to test the theory and look at one of the big players in the market – The Ford Ranger.

Case Study:

The Ford Ranger

It’s billed as class-leading towing capacity of 3,500kg, so lets take a look at some of the facts. We already know it can tow 3,500kg right? Wrong… and we’ll get to that in a minute.

GVM or Gross Vehicle Mass. In simple terms, this is the most that a vehicle can weigh with all its occupants, fuel, fridge, holiday gear and the dog.

Kerb Weight – Unlike GVM, kerb weight is the unladen vehicle weight.

GCM or Gross Combined Mass – The maximum amount of weight that both the vehicle and its trailer can weigh.

Ball Weight – The force exerted downwards on a vehicle’s tow-ball by a caravan or trailer.

Taking a look at the Ranger itself, the published GVM is 3,200kg with a GCM of 6,000kg. Assume we’re towing the maximum trailer weight of 3,500kg, this will drop our GCM down to 2,500kg. This is the maximum the Ranger can now weigh.

If we now subtract the kerb weight of 2,271kg from the remaining GCM of 2,500kg, we’re left with a paltry 229kg to play with. We haven’t even factored in the ball-weight of the caravan yet and that 229kg needs to cater for this as well as any aftermarket products such as bull-bars, tow-bars, fridges and the like.

The rule of thumb on ball weights is that it should be within 10% of your total trailer weight. Without even so much as a mars bar in the fridge of your caravan, assume that the ball-weight comes in at around 350kg of downward force added to your GCM. Technically, this means your vehicle and caravan combo has moved into illegal weight territory and you’re not even in the drivers seat yet, so remember – leave the dog behind.

Whilst we’ve used the Ford Ranger as an example in this instance, we’re pretty damn sure it isn’t the only naughty kid in the class, but with more and more vehicle manufacturers upping the ante in the braked towing department, we wonder if there will be any wool left on the sheep’s back.

So before you hitch up next time, remember to have a think about the overall weight of your set-up and whether you could be pushing the boundary of weight legalities.

2 COMMENTS

  1. Please if you are going to publish information like this get the facts correct.
    A light vehicle under the Australian Regulations does not have a GCM.
    Light vehicles have a “Towing Capacity”. Heavy vehicles have GCM.
    The Ford Ranger you identified has a GVM of 3200kgs.
    The Ranger has a Towing Capacity of 3500kgs. This is subject to the towbar package fitted.
    The Ranger alone can weigh a maximum of 3200kgs (GVM). This does include the information you provided above about load people and dog. It will also include any load imposed by the trailer as downforce on the towbar.
    The Ranger can still tow a trailer upto 3500kgs. The 3500kgs includes the total or Aggregate Trailer Mass (ATM) of the trailer. This is defined as the mass transmitted to the gorund through the tyres AND any downforce on the tow bar.
    I have been involved in policing and providing advice on these and similar regulations for 30 + years and know it is difficult to understand.

  2. Hi Malcolm,
    Why does the Ford official spec sheet for the Ranger have the Gross Combined Mass (inc braked trailer) listed in Vehicle Mass with this exact wording and it states 6000Kg?
    Essentially you are saying the vehicle cant exceed its GVM which is 3200Kg on its own and then you can add the trailer 3500Kg max. Assuming 10% tow ball weight is included in the 3200, that still means the Ranger is 3200 and the trailer wheels would be 3500 – 10% (350Kg) so all up it would be 3200 + 3150. Is that legal?

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