CONSTRAINT / BALANCE
Centre of mass and axle load
The aggregate centre of mass, the support polygon and exact gross two-axle reactions are enforced through the same constraint layer as geometry.
centre of mass · support polygon · axlesWhy it exists
Utilisation is not the only objective. A dense arrangement that puts the load over one axle is a compliance problem, not a good answer.
What a useful refusal looks like
The engine returns the rule that refused, the item it refused, and the measured value against the configured threshold. It also states how strongly that is backed: proven, observed, inferred, or unknown because a search limit was reached first.
See the fixtures for this rule ↗