Diminishing Load
The diminishing load is calculated by mathematically removing 10mm vertical "slices" from the rear of the payload, the effect of which is to shift the centre of gravity of the remaining load forward. This usually applies more to trucks and vans, rather than tractor/trailer combinations.
Notes:
1.    Actual diminishing load will be determined by operational factors. This graphic is intended to highlight a possible overloading situation.
2.    In the case of a single-drop delivery, any figure less than 100% and more than 0% will not apply, because the payload was unloaded all at once. If no overloading occurred when full, it will not occur when empty.
3.    Liquids (and loose cargo such as sand and gravel) will normally redistribute themselves to a relatively uniform pattern along the vehicle body, so any problem with diminishing load is unlikely to occur.