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Stiffening up the rear springs, or lifting the car or tow hitch may make it all look better BUT..... that is all cosmetic and may not address the issues.
In Australia even if you use a WDH, the car weights are assessed without the WDH tensioned.
As I discovered a few days ago when I had my whole rig weighed professionally at each wheel it quickly goes pear shaped on rear axle limits when towing with a Touareg.
My setup was 1100kg below the allowed GCM (6415kg) but I had still exceeded the allowed rear axle load limit by 90kg which on my 7P with air is 1530kg
In the car was just me (125kg :rolleyes: ) and a full tank of diesel (100 litres), no luggage or extras in the car, the caravan was heavy on the tongue at 320kg, ok I can shift load off the tongue easy enough to get back to 280kg but I still need to add partner and dogs to the car (another 115kg total)
For towing in Australia where the authorities are now beginning to look closely at axle load limits and overall limits this poses issues as the penalties are tough and insurance may not cover you if overloaded.
 

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I can tell you that I had mine professionally weighed a week ago
GCM van & car 5300kg
Rear axle came in at 1630 (yes 90kg over)
That includes;
  • 324kg on the ball ( yes too much )
  • 100 litres of diesel
  • 1 driver (125kg)
  • no luggage or passengers
That should give you an idea of how tough it is to manage
 

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Achievable if you have 2 passengers each 75kg, no luggage, half a tank of fuel and no more than 280kg on the ball
Then you can tow 3500kg
I LOVE this Touareg, and will manage by shuffling loads to reduce TBM
Already travelling with nothing but 40kg of dogs in the car ( oh and wifey who apparently doesn’t weigh much at all 😀)
 

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My van is a 2016 model and heavier on the ball at tare than some,
many of the newer vans are quite light on the ball to the extent that they are sometimes perform poorly on their first trip home from the dealers whilst travelling empty.
I feel the Touareg whilst having and excellent GCM it has the lowest rear axle load of common tow vehicles in Australia
comparison below (There may be some minor variations between models but for discussion this should do)
Tare MassGross
Vehicle
Mass
Gross
Combination
Mass
Towing
Capacity
(braked)
Towing
Capacity
(Unbraked)
Maximum
Towball
Download
Max
Roof Load
Max
Axle Load
- Front
Max
Axle Load
- Rear
2018
Jeep Grand Cherokee
2327 kg2949 kg6099 kg3500 kg750 kg350 kg68kg1452 kg1678 kg
2017
Volkswagen Touareg
2153 kg2860kg6415 kg3500 kg750 kg280 kg100 kg1380 kg1530 kg
2021
Isuzu D-MAX
2035 kg3100 kg5950 kg3500 kg750 kg350 kg1450 kg1650 kg
2021
Isuzu MU-X
2175 kg2800 kg5900 kg3500 kg750 kg350 kg1450 kg1650 kg
2021
Mitsubishi Pajero Sport - Exceed
2110 kg2775 kg5565 kg3100 kg750 kg310 kg80 kg1360 kg1600 kg
1840 kg (Triton)
Toyota LC2002740 kg3350 kg6850 kg3500 kg750 kg350 kg200 kg1630 kg1950 kg
Toyota Prado2240 - 2305 kg2990 kg5990 kg3000 kg750 kg300 kg
2021
Ford Ranger
2099 - 2278 kg3200 kg6000 kg3500 kg1480 kg1850 kg
2021
Ford Everest
2384 kg3100 kg5800 kg3000 kg750 kg1480 kg1750 kg
 

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Still Love my Touareg, I'd rather sell the van and get a lighter one!
Authorities seem to be increasing their monitoring of GVM, GCM and rear axle loading especially on the East Coast of Australia
 

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The are videos on you tube showing that adding air bags to the rear suspension, Eg additional load capacity, to level up the load actually increases rear axle load. Stiffening up the rear with bigger springs will increase rear axle load.
 

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can you explain the logic behind the tow ball height and the increased tow ball weight?
At a recent weigh-in we asked this question also of our tester.
To demonstrate the van TBM was done at 2" higher and 2" lower
The values did vary from the weight at level but only by < 5kg

I would think more significant would be if you are using the std 50mm ball you are limiting movement due to its less angular capability than a DO35 or similar
 

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In Australia for towing we are subject to keeping below the manufactures limits regards max rear axle load, TBM, GVM and GCM
In most cases the adjustable hitches move the ball mount point further away from the rear axle which exacerbates the issues already experienced in staying under the Touaregs 1530kg rear axle limit
[edit] also adjustable hitches are a great deal heavier than necessary this additional steel further adds to TBM which in turn adds at least 1.35 times its own weight onto the rear axle
 

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I believe current tow ball height is low for trailer, adjustable hitches a often big and heavy.
A custom hitch neck should be able to give required height with minimum weight snd rear axle offset
 

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There were several news items published on local TV showing use of wheel scales in roadside checks. Touareg’s unfortunately are not mass market vehicles in OZ in comparison to Toyota, Isuzu, Ford, Mazda, Nissan, thus access to certified GVM upgrades for a Touareg is all but non existent.
 

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Not just axle weights, where do they get GVM, GCM from for a Touareg, because as discussed previously the placard doesn’t show the values at all. Thus as per when I had my setup professionally weighed, they asked for the owners manual which has axle weights as well. I would imagine it is safe to presume that the police have access to the info (I hope I’m wrong)
From my calcs, with 2 passengers and 100 litres of fuel there is only 240kg of tow ball available (I would prefer to have all 280kg and some)
 

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@dragline1570 , I personally have not been through a police operation checkpoint. But state registration details for vehicles (in WA) do include tare and GVM values. WA police and I would imagine other states do have online access to vehicle registration details but as you say there is no obligation to carry the vehicle owners manual.
really the discussion of if the police have the details is moot, reality is they are doing this, be aware and try to be legal
 

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@dragline1570 yes I also had a 90kg over on rear axle when test weighed, some mods to loading have been made, but I would think I have some more to go.
So frustrating 😢
Reality was if I was towing with a std Pajero Sport I would be legally ok 😟 just because it has a higher rear axle limit
 

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The purpose of the weight distributing hitch is to (wait for it) distribute the weight between the front and read axles. There is a higher limit on the Touareg with the WDH than the load carrying hitch.
Properly setup the WDH will carry a tongue or pin weight of 1100 lbs and load carrying is about 700 lbs.
When you test the setup with the properly adjusted hitch and weigh each axle you should be able to keep the rear axle under its weight limit loaded
Whilst your description of WDH is correct, within Australia vehicles are weighed with the WDH disconnected (not tensioned)
 
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