More towing capacity confusion

Submitted: Thursday, Nov 22, 2007 at 20:36
ThreadID: 51887 Views:8834 Replies:3 FollowUps:8
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Gday

I spoke to two big caravan dealers today and asked about legal towing requirements. Both said that I was wrong when I said that tow ball weight is limited by the towing vehicles gvm and that passenger weight, fuel, accessories all reduced the legal tow ball weight. Quote "if you are right then no one towing a van would be legal". They both said that the only requirement was to be less than the towing vehicles maximum tow ball weight and towing weight. Other comments like "I've been doing this for 25 years and never heard of that" made me wonder who was right.

RTA should know, or so I thought, so I went here http://www.rta.nsw.gov.au/registration/downloads/2005_10_towingtrailers.pdf

and the only bit that referred to towing weight was this:

The loaded mass of the trailer must not exceed the lesser of:
Rated capacity of the towbar and tow coupling.
Maximum towing capacity of the vehicle.
Maximum carrying capacity of the trailer.
Maximum rated carrying capacity of the tyres.

So who is right here?

If I get a big van and have an accident, do I wave the RTA brochure at Mr Plod and the insurance companies and say "it's not a problem, read this".

John
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Reply By: Mogul - Thursday, Nov 22, 2007 at 20:40

Thursday, Nov 22, 2007 at 20:40
You are right. GVM is GVM not matter how it is achieved or where the load comes from.
AnswerID: 273183

Reply By: Member - Norm C (QLD) - Thursday, Nov 22, 2007 at 21:14

Thursday, Nov 22, 2007 at 21:14
John, in my view I believe you are right in what you are trying to say, but not in what you actually said.

You posted:
'I said that tow ball weight is limited by the towing vehicles gvm and that passenger weight, fuel, accessories all reduced the legal tow ball weight'

Passenger weight, fuel etc don't automatically reduce the legal ball weight. But if your GVM (including ball weight) exceeds the manufacturers spec, you must reduce to be legal. If you can't reduce elsewhere, then you must reduce ball weight.

If you have not exceeded GVM, then the vehicle load has no impact on the legal ball weight.

I suspect you meant largely what I have posted. But you did not quite say it.

You raise an important point though. Not a lot of people include their ball weight in their GVM. Most probably don't even know what their ball weight is (or their GVM for that matter).
AnswerID: 273195

Follow Up By: Axel [ the real one ] - Thursday, Nov 22, 2007 at 21:37

Thursday, Nov 22, 2007 at 21:37
In Qld your GVM and CGVM are on your rego sticker and printed plain as day on your rego papers. ,, the argument of "did not know " is not a valid defence.
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FollowupID: 536532

Follow Up By: Member - greg S (QLD) - Thursday, Nov 22, 2007 at 21:37

Thursday, Nov 22, 2007 at 21:37
Hi Norm,
I fully under stand that you should include the tow ball weight in the GVM, but it gets confusing when you read website's like the Nissan one regarding the GVM and tow ball weights. I copied this from their site regarding the Patrol.

Greg


** GVM includes the driver, six passengers (ST, ST-L & Ti models) or four passengers (DX), full fuel tank/s and luggage.

Genuine Nissan Extended Warranty
Ask your Nissan Dealer (or phone 1800 035 035) to find how easily you can extend your Factory Backed warranty. Good for you, great for your Nissan.

^ Towing capacity is subject to towbar/towball capacity. The capacity may be reduced if a non genuine Nissan towbar is fitted. The permitted download is directly related to the laden mass of vehicle. At the maximum laden mass of the vehicle (Gross Vehicle Mass - GVM**) the maximum towball download is 200kgs.
Towball download Loaded vehicle mass
200kgs GVM** (all models)
250kgs Reduce loaded vehicle mass below GVM** by 150kgs
300kgs Reduce loaded vehicle mass below GVM** by 220kgs
350kgs Reduce loaded vehicle mass below GVM** by 290kgs

If the loaded vehicle mass is reduced as shown in the table, the towball download can be increased correspondingly. Accordingly, if the laden mass is 290kgs less than the GVM**, a towball download of 350kgs is approved.
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FollowupID: 536533

Follow Up By: Mogul - Thursday, Nov 22, 2007 at 21:43

Thursday, Nov 22, 2007 at 21:43
I read it as if you have a towball weight of 350kg's the GVM is reduced by 290kg's.

GVM's would be caculated based on the load being spread evenly over both axles. 350kg towball weight isn't providing a load spread over both axles.
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FollowupID: 536535

Follow Up By: Mogul - Thursday, Nov 22, 2007 at 21:49

Thursday, Nov 22, 2007 at 21:49
eg. 350kg towball weight means new GVM is 290kg's less
300kg towball weight means new GVM is220kg's less
etc, etc.
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FollowupID: 536542

Follow Up By: Member - greg S (QLD) - Thursday, Nov 22, 2007 at 22:04

Thursday, Nov 22, 2007 at 22:04
Mogul,

But at 200kg tow ball weight, you can still have your maximum GVM, according to Nissan!!

Greg
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FollowupID: 536549

Follow Up By: lifeisgood - Thursday, Nov 22, 2007 at 22:20

Thursday, Nov 22, 2007 at 22:20
Often there is not a simple answer in these matters. Add to that the capacity of different tow bars and hitch receivers (1600kg/250kg/350kg for example) and some manufacturers place speed limits on heavy towing loads (from memory -ford sedans for example) Then there is retrospective upgrading where market forces force a manufacturer to upgrade towing capacities.
(Mitsubishi Pajero for example) So even the handbook on some models can be superceded.
I guess there is no point going to the likes of a caravan show to decide on buying a van without first sorting out the tow ball rating of the intended towing vehicle. There should still be some capacity within the GVM for a bit of gear in the back and some may be allocated to the trailer.
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FollowupID: 536557

Reply By: Doggy Tease - Thursday, Nov 22, 2007 at 21:47

Thursday, Nov 22, 2007 at 21:47
^ Towing capacity is subject to towbar/towball capacity. The capacity may be reduced if a non genuine Nissan towbar is fitted. The permitted download is directly related to the laden mass of vehicle. At the maximum laden mass of the vehicle (Gross Vehicle Mass - GVM**) the maximum towball download is 200kgs.

Towball download Loaded vehicle mass
200kgs GVM** (all models)
250kgs Reduce loaded vehicle mass below GVM** by 150kgs
300kgs Reduce loaded vehicle mass below GVM** by 220kgs
350kgs Reduce loaded vehicle mass below GVM** by 290kgs

If the loaded vehicle mass is reduced as shown in the table, the towball download can be increased correspondingly. Accordingly, if the laden mass is 290kgs less than the GVM**, a towball download of 350kgs is approved.
Different trailer types and different trailer manufacturers have varying towball downloads. The customer will need to contact the trailer manufacturer for information as to the download.
Nissan is not able to make any recommendation on the use or suitability of load-levelling or weight distribution devices to be fitted to the vehicle. Customers should contact the manufacturers of these devices for further information


This is directly from the Nissan Australia website.......^^^^^^^^

WEIGHTS & CAPACITIES
(Note: Kerb, tare & payload weights are nominal and will vary depending on options and tray/body type.)
Kerb Weight (kg) 2630-2700kg
Gross Vehicle Mass (kg) 3300kg
Maximum roof load (kg -Includes roof rack weight) N/A
Seating capacity (includes driver) 8
Luggage capacity (litres) N/A
Cargo volume N/A
Fuel Tank Capacity (litres) 138 litres
Vehicle Towing capacity - with trailer brakes (kg) 3500kg
- Without trailer brakes (kg) 750kg
Genuine Towbar D/F
(Note: Genuine Towbar Capacity - Refer to Genuine Accessory Guide, as it may differ from Vehicle Towing Capacity in some circumstances.
Towing capacity - Subject to state regulations, towbar design and towing equipment.)


This is from Toyota.......^^^^^^^^^^^

meow.

rick.
AnswerID: 273205

Follow Up By: Mogul - Thursday, Nov 22, 2007 at 21:52

Thursday, Nov 22, 2007 at 21:52
The Nissan info is badly written. You CAN"T increase the GVM.
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FollowupID: 536545

Follow Up By: Stu050 - Thursday, Nov 22, 2007 at 22:50

Thursday, Nov 22, 2007 at 22:50
Yes you can increase the vehicle GVM, it just costs money for the imspection and engineering report for DOT.
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FollowupID: 536564

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