Towing a 6m Lotus Trooper Caravan wit my 2001 GU 3litre turbo

[jff45]

Think I understand. It's complicated issue. Basically as far as I can understand, the trailer cant exceed Gross Trailer Mass (GTM). The vehicle cant exceed GVM. The total combination cant exceed GTM + GVM minus ball weight. Am I right?

Sorry, I missed this reply. The GTM is actually irrelevant in relation to towing capacity. It’s more of a number to match against the vans axle capacity.

The vehicle can’t exceed GVM. It’s stamped by Nissan on the VIN ID plate but can be overridden by an engineer. I had my 2001 GU upgraded last year from 2960 kg to 3550 kg.
The hitched van and tug can’t exceed GCM. Nissan don’t give a GCM so it’s accepted as being the GVM + towing capacity.
My GCM is now 6050 kg because my towing capacity for the auto trans is 2500 kg and that can’t be changed.