Aggregate trailer mass

Submitted: Saturday, May 26, 2007 at 16:23
ThreadID: 123685 Views:4990 Replies:3 FollowUps:4
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Hi All,
Can anyone give me an explanation of Aggregate trailer mass 3500kg which is on the compliance plate of my BT, it also has the axle group at 3500kg, does this mean that BT can not weigh more than this fully loaded with water tanks full etc. The Tare weight is 2760kg which I guess is the weight when Bushtacker register BT, any clarification would be appreciated.
Regards
Eric
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Reply By: Turist - Saturday, May 26, 2007 at 18:51

Saturday, May 26, 2007 at 18:51
AGREGATE TRAILER MASS (ATM) - The total mass of the laden trailer when carrying the maximum load recommended by the manufacturer. This includes any weight transferred by the coupling when attached to the towing vehicle.

Simplicity suspension come in various weight carrying capacities.
In your case you have a 3500kg suspension pack.

Keeping the ATM at or below 3500kg give a manufacturer more tolerance when designing tow couplings, drawbars etc.

Coupling stengths for trailer ATM over 3500kg must be tested to and stamped with either the rated ‘D-value’ and ‘V-value’ or only the’ D-value’ in kN.

Hope this helps (hope I am correct)

Bob
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Follow Up By: adams44 - Sunday, May 27, 2007 at 05:03

Sunday, May 27, 2007 at 05:03
Hi Bob
I have some where the cal's required to get to a "D" value, got them when talking to VC one day took almost 4 hours to find the right person who could work them out, do you happed to know them.
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Follow Up By: Turist - Sunday, May 27, 2007 at 06:24

Sunday, May 27, 2007 at 06:24
The 'D' value of a coupling is a strength rating. The 'D' value represents the maximum permissable value of the calculation:

(Towing Vehicle Mass x Trailer Mass)
-----------------------------------------
(Towing Vehicle Mass + Trailer Mass)
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Reply By: adams44 - Sunday, May 27, 2007 at 22:25

Sunday, May 27, 2007 at 22:25
That sounds about right, have not looked it up yet but if you calculate that out with AVM of 4182kg"Chev" and a ATM of 3300"BT" you would get 1845 gee long time since i did sums like this " not sure i ever did" would this be correct if so what does 1845 mean
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Follow Up By: Turist - Sunday, May 27, 2007 at 22:47

Sunday, May 27, 2007 at 22:47
It means if the "D" rating of the coupling is greater than 1.85 that you are OK.
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Reply By: adams44 - Monday, May 28, 2007 at 03:01

Monday, May 28, 2007 at 03:01
I thought so, then when you get a tow hitch stamped 3.5, a tow ball stamped 3.5 and a tow bar stamped 3.5 beaing in mind the numbers we have used the saftey margin would appear to be 100%.
As i remember it at the time i looked into it the "D" rating i was told was only used for gov reg's for the general public type operations like ours, now that larger 4x4 and trailers are avalable this might change. imho the " D " is really of no use at all when you look at say the 3.5 A/T hitch from VC and also the Hyland 3.5 off Road hitch you woud think you be able to tow a lot more that they are rated for.
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Follow Up By: Turist - Monday, May 28, 2007 at 05:02

Monday, May 28, 2007 at 05:02
You can not legally tow a trailer with an ATM >3500kg with any component of the tow pack, (ball, hitch, towbar or tow vehicle) rated at 3500kg or <3500kg.

Bob
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