They go off the maximum gross weight of the trailer, a 2 ton trailer is still counted as 2 tons even if when empty it only weighs 1 ton. The maximum gross weight should be on a manufacturers plate somewhere. I guess it saves plod taking you over a weigh bridge before they can prosecute you.
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Tim
1968 Volvo 145 long term project.
Currently without a Volvo daily driver.
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