But you suggested that there is a possibility that the trailer wasn't as it was towed in therefore un prosecutable. And on previous threads you have stated that the trailer weight is mgw of the trailer plus towbar imposed weight. Which it clearly isn't otherwise weighing it like that wouldn't achieve anything.
Its not as it was towed in.
It was coupled up.
Nose weight is weighed as part of the vehicle.
The nose weight is weighed with the vehicle, you cant weigh it twice.
The vehicle cant be fully loaded to its MAM & then also have a trailer attached or its MAM will be exceeded.
Or the vehicle weight plus trailers weight would add up to ,more than the actual total.
Example
vehicle on its own weighs 3250kg
Trailer on its own weighs 3250kg
Added together they weigh 6500kg.
They weigh them using drive over scales to get each axle weight or a platform with the ability to weigh each axle.
The vehicle weighs in at 3400kg & the trailer at 3100kg. Still the same total.
They now for reasons unknow decide they want to re weigh the trailer on its own.
The trailer now weighs 3250kg making the theoretical total 6650kg if they dont also re weigh the vehicle.
The vehicle must be weighed with trailer attached or they might miss the rear axle being overloaded or its MAM being exceeded.
If I can find it I will copy it here but I have a reply from DVSA tech that confirms that they do not uncouple trailers to weigh them normally (also remember this was a police stop not DVSA). As its the as used weights that are needed.
Much is said re 5th wheels being treated differently to ball hitches yet the regs do not support this.
HGV & non HGV have different regs.
BE combination 5th wheels can have 3500kg trailer that actually weigh north of 4000kg as the applied load is weighed with the vehicle as part of its load.
Some pickups cant be fully loaded when towing its legal max trailer weight either as the GTW is shared.
The confusion comes from lorry drivers & TM's as the regs for lorry trailers means that the unit has to be plated for the applied load but the trailer also has to be plated for its actual total load not accounting for the applied load.
Example
Unit weights 8t but is plated to 20t
Trailer is plated to 36t
About 1/3rd of trailers weight is applied to the unit making its in use weight about 20t and the trailers in use weight about 24t.
Under car regs the trailer would only need to be plated to 24t.
But I will say it again, this is all pointless as the 5% allowance will in most legal cases be less than the applied nose weight for a post 19-01-2013 BE combination.
A trailer with the correct nose weight weighing 3500kg through the wheels could be up to 3650kg when uncoupled (150kg nose weight) yet the 5% takes you to 3675kg anyway. You should only get ticketed if you are over that or over one of the other limits.
For most people nose weight is a non event unless it puts the rear axle load over its limit or takes the vehicle over its MAM.
I think in that pic they said it was about 500kg over which will possibly be why it was weighed uncoupled. As it was a high % overloaded.
They should have also queried why the mast was not lowered & stowed properly (looks like it would then not fit on trailer) & if its current height is over 3m then it would need a height sign in the cab.