Tongue Weight Scale helps you know your tongue weight , so you can balance your load, providing a safer, more confident tow. Trailer tongue weight should be 10-15% of the total trailer weight for most bumper-pull trailers. If the tongue weight is too low, the trailer will be prone to sway. If tongue weight is too high, the tow vehicle’s rear axle could be overloaded and steering could be light and cause drifting. 220lbs to 780lbs (100kgs to 350kgs) 20”x4”x4” Steel Mattel