"Between 2016 and 2020, there were 215 casualty crashes involving a vehicle towing a caravan on NSW roads. These crashes resulted in 17 fatalities and 116 serious injuries." - Transport for NSW
With international travel restrictions and internal flight reductions there has been significant growth in the domestic Caravan and RV sector over the last two years. With the majority of growth being first time caravaners / towers there is a greater need of awareness for safe towing practices and legal requirements. To try and curb the expected increase of related accidents state governments are updating the available resources to educate drivers and help them travel and arrive safely.
See the spectacular video of poor weight distribution when towing a caravan...and what you can do to stop it.
Tare Mass is the total mass of the caravan with no load, unoccupied and with all fluid reservoirs, if fitted, filled to nominal capacity, and with all standard equipment and any options fitted. After market optional add-ons (TV, mattresses, extra gas bottlles, awnings etc) are not inlcuded in the tare mass and are considered as a load, so must be included in your ATM measurement. The tare mass weight of your caravan can be found on the vehicle plate or in the manufacturer's handbook.
Tow ball mass (or tow ball load) is the maxium mass allowed to be put on the tow ball of the towing vehicle. You can find the tow ball mass capacity in your coupling manufacturer's handbook. To measure the tow ball mass you can use a ball weight scale. You must not exceed the tow ball mass capacity.
Aggregate Trailer Mass (ATM) is the total mass of the trailer when carrying the maximum load recommended by the manufacturer. The ATM is generally measured with the caravan unhitched from your towing vehicle and resting on its jockey wheel. The maximum ATM of your caravan can be found on the vehicle plate or in the manufacturer's handbook and must not be exceeded. To measure your ATM, weigh your loaded caravan resting on its jockey wheel, including full water tank, gas tanks and everything you would pack to go travelling. Ensure that your measured mass does not exceed your specified ATM capacity.
Gross Trailer Mass (GTM) is the maximum mass recommeded by the manufacturer of your fully loaded caravan when it is hitched to your tow vehicle. The GTM of the caravan is transmitted to the ground by only the caravan tyres and excludes the mass distributed to the towing vehicle through the coupling. The GTM of your caravan can be found on the vehicle plate or in the manufacturer's handbook and must not be exceeded. To measure your GTM, weigh your loaded caravan when it is attached to your towing vehicle, and make sure your measured mass does not exceed your specified GTM capacity.
Gross Vehicle Mass (GVM) is the maximum total mass of a fully loaded motor vehicle as specified by the vehicle manufacturer. For some passenger vehicles, it might be known as the Maximum Loaded Vehicle Mass (MLVM). To measure your loaded vehicle mass, weigh your fully packed towing vehicle, including passengers, with the caravan hitched and ensure it is less than your vehicle's maximum GVM or MLVM.
Gross Combined Mass (GCM) is the maximum mass set by your tow vehicle's manufacturer and refers to the maximum combined mass of your loaded tow vehicle and your loaded caravan hitched together. Your vehicle manufacturer's guide will provide you with the GCM of your tow vehicle. To measure the GCM, weigh your fully loaded towing vehicle hitched to your fully loaded caravan. Legally, you must not exceed the specified GCM capacity of your vehicle. This means that you cannot move extra weight from your caravan to your tow vehicle if it exceeds the ATM and GCM.
The effects of poor Weight Distribution range from minor handling issues and excess vehicle wear, through to dangerous sway and loss of control.
Your caravan and tow vehicle should still appear level when connected.
For many caravans simply redistributing the weight of the items you carry will be enough.
Your caravan and tow vehicle should still appear level when connected.
A simple way to check is to always carry a Tow Ball Scale. You simply lower the caravan coupling on to the scales and take a reading after your caravan is packed.
If re-arranging the load is not an option or you just want the extra piece of mind then the next step is adding a Weight Distribution Hitch.
The Weight Distribution Hitch is a physical connection between the tow vehicle and the caravan. It spreads the load and levels out the vehicle.
They are simple to install and use but they are an extra step each time you hook up. You may also need to remove them if you need to reverse around any tight corners.
The main difference between the different Weight Distribution Hitches is the strength. We have an article on How to choose the correct Weight Distribution Hitch here. The short version is (as long as it fits) the only downside to a higher strength hitch is the cost.
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1 Comments
Peter
I was recently pulled over by a highway patrol and fined for not having "towing aid mirrors" attached to the vehicle mirrors. I was not aware of this requirement and surprised to receive a fine. On our trip home we observed a number of other rv's being towed also without towing aid mirrors. I am surprised in the first instance that the additional mirrors are a legal requirement and secondly for being fined for a requirement I was not aware of. How does this get communicated by the RMS, you would have to question how many rv users are not aware of this requirement?