Procedure for Weighing BMT?

[rat_catcher]

When taking a trailer boat to a weighbridge to get a certificate, what is the correct procedure for getting the proper weight?

Do you leave the trailer connected to the tow vehicle, but only position the trailer wheels on the weighbridge?

Or do you disconnect the trailer from the tow vehicle and use the jockey wheel as well?

The reason I ask is that there will be a few hundred kilos of weight taken by the tow vehicle (downforce on the coupling) and thus when connected to the vehicle I think the weight measured of the BMT will be less than when it stands alone. Is this correct?

Which is the proper way to get the BMT measurement?

[krazyfisher]

to get a true reading you will have to discount it and use the jockey wheel that is the only way

[Brumby]

Asked the question of local QLD transport office, when I was looking into setting up to tow my rig. As I understand their answer, for the purposes of the law you take into account only the weight on the wheels, ie have normal weight on the drawbar and put only the trailer wheels onto the weighbridge. You got to ask yourself though, if it's worth trying to skate around the weight limits if thats an issue. Physics is likely to catch up with you somewhere down the line.

[krazyfisher]

if you are after GVM you need to unhook and weight

[Alchemy]

I took mine to the Rocklea weigh bridge. Weighed it both ways, ie coupled and uncoupled from the car. When complete they gave me a certificate with all info. Only cost $20. Just look up public weigh bridges in the yellow pages, and you'll find one in your area.

Regards,
Dave.

[FNQCairns]

The vehicle manufacturer will want to know the total weight of the towed rig so weight it on 3 wheels, the scalies will want to know the weight of the trailer while still attatched to the vehicle so weigh it with on the 2 trailer axle wheels OR the scalies may want to know the entire weight of all combined so weight both separate (doubt they would care though)

cheers fnq

[Kleyny]

Asked the question of local QLD transport office, when I was looking into setting up to tow my rig. As I understand their answer, for the purposes of the law you take into account only the weight on the wheels, ie have normal weight on the drawbar and put only the trailer wheels onto the weighbridge. You got to ask yourself though, if it's worth trying to skate around the weight limits if thats an issue. Physics is likely to catch up with you somewhere down the line.

Sorry to correct you on this one. but by the law you must disconnect the trailer. Why as this is the correct ATM (Aggregate Trailer Mass). Aggregate meaning the whole thing. If you don't take it apart you are only getting the axle mass.

I understand you have been told by QT but the people behind the counter at the customer service centres no how to take your money and not much more and certainly minutes about the legislation.

You were close to asking the correct people but you should have asked a Transport Inspector.

Neil

[rat_catcher]

Thanks guys. Sounds like I should do it both ways. Also I know the rig is well over 2 tonnes, so that is not the issue. I just want to make sure it does not go past 3.5 tonnes fully loaded.

[rat_catcher]

OK given HONKY DORY's response, I guess I will just disconnect it and take the worst case scenario.

[Kleyny]

The vehicle manufacturer will want to know the total weight of the towed rig so weight it on 3 wheels, the scalies will want to know the weight of the trailer while still attatched to the vehicle so weigh it with on the 2 trailer axle wheels OR the scalies may want to know the entire weight of all combined so weight both separate (doubt they would care though)

cheers fnq

Now we are talking about two seperate things.

1 ATM weight of the whole thing
2 Axle mass weight of the axle only.

You can be fined/ in trouble on both 1 If the Transport Inspectors or more importantly your insurance company weigh your trailer and find the ATM is over or they weigh it and the ATM is AOK but because the way you have loaded it you axle weight is over.

As you said FNQ weigh the both as if you were going out fishing(eskies, full fuel, and anything else you normally carry)

Hope hope this makes sense.

Neil

[Cloud_9]

the way i did mine was.
took the car through first. the weight was 2000kg.
then took the car and trialer with boat through.
as i drove through the weight comes up on the scales.
and as i drove through.
the scales showedthe car with trailer attached was 2120 KGs
so that told me i had 120kgs tow ball weight.
and when i got all the trailer on the scales the whole lot weighed 3350Kg's
so the BMT weighed 1360 KG's the trailer tare is 360 Kg's so its just math.
leaves the boat weight is 1000KG's.
just easy.
cheers Cloud 9.

[Brumby]

Honky Dory, can you point me in the direction of the relevant legislation? I was told that the GTM is the determining factor and want to get this one clear once and for all.

Cheers

[Kleyny]

For the defintion of ATM/GTM try the Transport Operation (Road Use Management- Vehicle Standards and Safety) Regulations 1999. Schedule 4 (dictionary).

it states: ATM (aggregate trailer mass) for a trailer-

(a) Means the maximum mass, specified by the manufacturer, for the loaded trailer, and
(b) includes any mass imposed on the vehicle towing the trailer when they are in a horizontal surface.


hope this helps

neil

[Deiter]

the way i did mine was.
took the car through first. the weight was 2000kg.
then took the car and trialer with boat through.
as i drove through the weight comes up on the scales.
and as i drove through.
the scales showedthe car with trailer attached was 2120 KGs
so that told me i had 120kgs tow ball weight.
and when i got all the trailer on the scales the whole lot weighed 3350Kg's
so the BMT weighed 1360 KG's the trailer tare is 360 Kg's so its just math.
leaves the boat weight is 1000KG's.
just easy.
cheers Cloud 9.

Yep, that's the way i did it.
Drove down to the local tip, asked the guy if i could weigh my boat, he says sure, tells me weight of car, then come back with boat (only 5 mins away), weigh car again, then weigh the lot. Slip operator a tener and everyones happy.
No certificate though, but i did get the printout.

[FNQCairns]

Honky Dory, what definition of the regs would the scalies be weighing if they only weighed the trailer axle wheels in a forced inspection at the side of the road.

All these abstract regulatory definitions get pushed out of my head for important fishing and family stuff, remembering by relating to an action stays put for at least twice as long

cheers fnq