As it appears that you know the subject extensively, perhaps you can post up links to the articles.
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Some might suggest that anything Collyn Rivers writes may need to be taken with a pinch of salt to be honest if all his work is like his Electrical advice - some of which should be listed in the 'Fiction' section of the Library.
So, if you have links to some technical docs by some Engineers of note and not a self proclaimed 'Expert' I'm happy to read through it.
Others might suggest that this is playing like a thread on a caravan forum.[bigsad]
OK, so I’m NOT going back to square one!!
Because I have a knack from reading stuff like this, I have now read through a whole bunch of ADRs......starting with the applicability summary to work out which apply. Of those there were a few obvious ones exclude but i am pleased to report that in ADRs:
38 Brakes
42 General
43 Vehicle configurations and dimensions
44 Specific vehicles
62 Mechical connections
NOWHERE mentioned drawbar or towball or ball weights. There is no mention of 10% anywhere either.
There is also a Vehicle Standards Bulletin which talks about ATM and GTM as definitions and the only comment is
Note
Except for semi-trailers, the difference between the ATM and GTM is usually small.
So once again, its not specifically in the ADRs. The certifier is wrong.
Manufacturers now specify ball weights for their vehicles as do tow bar makers - I think the cops will have a list of vehicles and approved ball weights and measuring that - eg my RRS is 350kg so if the van I was towing had an actual ball weight of say 400kg then I would be busted.
Hopefully busted by the common sense Police as well...
I keep getting the opinion that people have no concept of just how heavy 350kgs actually is...( yes I know thats dumb statement,, but you get my meaning)
Agree....
I think we get it/accept there is no reference to tow ball weights in ADR’s just like ADR’s don’t set GVM’s.
Pretty certain all late model cars have a max tow ball weight stated by the manufacturer therefore this would be what police/inspectors would be enforcing.
Your tow Ball is ultimately restricted to tie difference between the tare including people and load and either the cars GVM or rear axle weight, both of these are not set by ADR but are set by the manufacturers and is what’s the police/inspectors would be enforcing.
Vehicle handbook is all that is required.
Oh and it seems to be a coincidence that a good number of manufacturers set the max. Tow ball weight at ~10%.....maybe all the engineers come out of the same university.
Myself, I always ensure I have a positive tow ball weight, and know my total weights (GVM and rear axle). Like the other day I had a tow ball weight of 180kg, trailer 1080kg....well over 10% but under max tow ball weight....apparently you need brakes on a trailer over 750kg 🤫