How many times more likely is a fully loaded combination rig to roll over in a crash compared to an empty rig?

AAMVA CDL Manual, Section 6.1.1 'Rollover Risks,' p. 6-1

Rollovers cause more than half of all truck driver deaths in crashes, so understanding why a loaded trailer is so much more unstable is a core safety concept, not a trivia fact. Knowing the magnitude of the risk reinforces why cargo placement and cornering speed deserve extra attention on every loaded run.