You must be talking of massive big rigs,as far as I can work out mine is within the law,but there again I could be working it out wrong. Isuzu, gross wt.2900kg, max.tow wt.3000kg, payload 1000kg, 5th wheel caravan, kerb wt.2095kg, gross wt.3174kg,I would need to cut my payload down by 174kg minimum to keep it within the Isuzu's 3000kg max.tow wt.
On the day they'll find something if they want to.
When I had the Motorhome I travelled for years in ignorance of a payload, until I became a member of motorhome club, and read all the forums,then I became paranoid with payloads,which took the fun out of the motorhome,as they have a small payload for the 3500kg gross,its a true saying "ignorance is bliss" until your caught
Donnie Ban (Donald)