Hitch Balls Atwood has a variety of 2" or 2 5/16" companion hitch balls to meet trailer towing applications from 5,000 to 40,000 lbs. gross vehicle weight. Forged or machined using high-strength fatigue-resistant steel, Atwood hitch balls are deigned to mate with specific Atwood couplers for optimal fit, long life and trouble-free performance.