Curiosity got the better of me and I did a bit of browsing on GVM / GCM / Towing capacity. The following is from statewide4x4.com.au's FAQ's and highlights some vehicle limitations when it comes to true towing capacity. Fortunately the D3/4/sport have a true 3.5 tonne towing capacity, that is GVM + 3.5t = GCM
GVM Upgrade & GCM FAQ's / Have A Question About Your GVM Or GCM?
"How Much Can I Really Tow?
What a lot of vehicle manufacturers will not tell you is that towing up to your maximum towing capability can sometimes (but not always) affect the amount of weight you can carry in your vehicle.
For Example:
Ford PX Ranger: GVM 3,200kg / GCM 6,000kg
Ford advertises that the vehicle has the ability to tow 3.5T which it does, however if you take a closer look at the vehicles specifications you will see that the GCM cannot exceed 6000kg. If you take 3500kg max towing capacity from the GCM that leaves you a maximum allowable vehicle weight of only 2,500kg.
GCM: 6000kg - 3500kg (max towing) = 2,500kg
To be able to tow, 3.5T with the PX Ranger you need to take 700kg out of your maximum allowed GVM figure of 3,200kg. If you then look even further into the vehicle specifications it is even more of an eye-opener. Lets assume that you are still towing the maximum amount of 3.5T with the PX Ranger which we will say is a Dual Cab XLT.
GVM (with max towing): 2,500kg - Vehicle Tare Weight: 2,159kg = 341kg
So you are now left with a payload of 341kg. Lets take out a couple more essential items from that figure.
Payload: 341kg - Tow Ball Down Force Approx: 280kg - Fuel approx 70kg = - 9kg
So on a Ford PX Ranger XLT towing 3.5T with a full tank of fuel and approx 280kg of ball weight you are already over your GCM. Now try to add a driver, additional passengers, any luggage, a fridge, bull bar, winch etc and you will be well over your allowable limit. This makes your vehicle unroadworthy and in the case of an accident you risk voiding your insurance payout. As you can understand it is important information that the consumer really should be made aware of."
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