Nah it all works out...
Assume you have a Trailer of 3500 ATM with 10% ball load.
Assume a Patrol loaded to 3060 GVM.
3060 GVM + 3500 Braked Towing capacity means a GCM of 6560
(Under ADR's a vehicle GCM unless otherwise stated by Manuf is the sum of GVM and manuf stated towing capacity)
You decide you want to now tow the Trailer alas your 350 Kg ball weight means GVM now decreases by 290 and GCM therefore becomes 6270 (2770 new GVM + 3500 same ATM).
So you take 290 out of the 'Trol which is now loaded to 2770 and connect up and go to weighbridge.
Your 'new" GCM is 6270 and the weighbridge will show a weight of 6270.
Made up of Patrol 2770, Tow ball load 350, GTM of 3150 or if you prefer Patrol 2770 and 3500 ATM
You have met your new reduced GVM
You are not towing an overloaded Trailer as it is still the same ATM
You have not exceeded Towball weight
Your Rig is not over GCM
You have not exceeded your towing capacity
God is in his heaven and all is right with the world :-)
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