The Weigh Safe Drop Hitch effectively measures the tongue weight of your towing load, ensuring that your vehicle is balanced properly and is safe to tow. Injuries, fatalities, and loss of property are all preventable by ensuring proper tongue weight. Pressure on the ball sends a reading to the built-in scale that measures tongue weight (lbs.) GMC guidelines for proper towing states tongue weight should be no less than 10 percent of gross trailer weight (GTW) and no more than 15 percent. For example, tongue weight for a 10, 000 pound trailer should be no less than 1, 000 lbs. and no more than 2, 200 lbs. Note: Weigh Safe max tongue weight is 2, 200 lbs. Do not initiate tow if your reading is in the red zoneFeatures: Weigh Safe comes in three different drop sizes â 10", 6", and 4" â that adjust in one-inch increments.. Weigh Safe can also be used in the rise position. Since 1975, trailer-related fatalities have climbed to 19, 582. Since 1988, reported injuries have surpassed 800, 000 and over 2 million vehicles, boats, trailers, and other property have been damaged or totaled Weigh Safe won the 2014 SEMA award for Best New Tools and Equipment Weigh Safe comes in both 2" and 2.5" shafts to accommodate both older and newer truck models. | Weigh Safe Adjustable Drop Hitch - 4" Drop for 2.5" Shank in Red