manski:
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Just out of interest, it is possible to use a Tapley meter to check trailer brakes but the maths is quite messy to set it up. I believe the some of the, expensive, electronic ones are also able to do that automatically ?
The Tapley was one of the original pendulum type decelerometer and only knows how much it is tilting/ decelerating and only in one direction (forwards and nil side wards), so it can’t differentiate if it’s in the cab of an artic rigid or the basket on a bike’s handle bars.
There are now electronic versions such as BrakeSafe that are marginally better but can’t identify off balance, grabbing etc.