What is the primary danger of driving a commercial vehicle with mismatched tire sizes or severely uneven tire pressures on a dual-wheel set (conjunto de ruedas gemelas / duales)?

1. The tires turn different colors
2. The larger or higher-pressure tire carries the entire axle load while the smaller tire scrubs and drags, generating extreme frictional heat that causes tire blowout, tread separation, and wheel bearing failure
3. The vehicle uses 50% less fuel
4. The engine oil level drops to zero