Usually, hitches rated Class III or larger have two ratings for GTW and two for TW. The Weight Carrying (WC) ratings for GTW and TW are typically 5,000/500, sometimes higher; More about this in a moment. Quote; Share this post. The entire assembly is robotically welded for consistency and for high weld penetration. They also use very large cross tubes and employ cast-steel reinforcement brackets and reinforcement rings around the outside of the receiver tube. Technically, it's a classification used in the towing industry to identify towing equipment â hitches and such related items as ball mounts, hitch balls, trailer couplers, and safety chains that make up the towing connection between vehicle and trailer â that are rated to handle loads of 5,000 pounds or more. This new standard will make comparisons between truck brands easier and more consistent and will produce, going forward, tow ratings that are more accurate and realistic.Aftermarket hitches, while not designed in conjunction with the vehicle, are a proven way to equip your truck or SUV for towing if it didn't come from the factory with a towing package or if it came with a hitch not heavy-duty enough for your trailered rig. Shop Bass Pro Shops online or in store for boat trailer parts & boat trailer accessories. These two companies have made recent improvements to their heavy-duty aftermarket receivers to make them more versatile as well as capable of carrying heavier loads with less chance of breakage. So this article will focus on the WC ratings. Tracker bass boat hitch ball size? For most trailered boats, however, the tongue weight is typically less; 5 percent of GTW is normal.Confused? It could be either.Be advised that while a 1-7/8 coupler won't go on a 2" ball, a 2" coupler won't *STAY* on a 1-7/8 ball.Ask the owner for the ball size, as mentioned before.