Trailers with a GVWR of 3001 to 10000 pounds are required to have:

Trailers with a Gross Vehicle Weight Rating (GVWR) of 3001 to 10000 pounds must have brakes on at least one axle of all wheels to ensure safe stopping performance. This requirement is vital for maintaining control and stability during towing, especially when the trailer is loaded. The braking system is crucial for preventing accidents, as heavier trailers can exert more force on a towing vehicle when decelerating.

The incorporation of brakes on at least one axle helps distribute the braking power more evenly across the trailer, reducing the likelihood of skidding or loss of control when coming to a stop. This measure enhances safety not only for the driver of the towing vehicle but also for other road users.

Other answer choices suggest either insufficient braking systems or an absence of brakes altogether, which do not align with safety standards set for trailers in this weight range. Trailers that lack adequate braking can lead to hazardous situations, especially under heavy loads or on inclines. Therefore, the requirement for brakes on at least one axle of all wheels is a key aspect of ensuring safety in towing operations.