Trailer hitch ball for Toyota 4Runner
Choosing a trailer hitch ball for a Toyota 4Runner is less about matching a single part number and more about aligning the ball with your receiver, coupler, and the load you actually tow. A 4Runner’s factory and aftermarket towing setups have different ratings, mounting heights, and trailer tongue geometries, so the correct ball is one part of a safe tension connection. The decision depends on the trailer coupler size, ball shank diameter, weight rating, and rise or drop needed to keep the trailer level.
The direct answer
For most 4Runner owners, the immediate answer is a 2-inch or 2-5/16-inch ball selected by the trailer coupler stamping, not by the SUV trim level alone. The ball must match the coupler socket size and exceed the loaded trailer weight. Because 4Runner hitch receivers accept common shank diameters, the first practical step is to read the coupler and confirm the shank hole in the ball mount before buying.
The condition that changes this answer appears when the 4Runner uses a factory hitch with a lower receiver opening or an adjustable ball mount. If the trailer sits nose-high or nose-low, the ball’s static capacity still matters, but the rise or drop changes the effective load path. Matching shank diameter, torque, and the hitch pin hole prevents the ball assembly from becoming the weak point in the Toyota 4Runner trailer hitch ball setup.