I'd take the reading with a grain of salt. i have one & when i loaded trailer onto it it went down to about 160kg, i gave it a bit of a push & pull just to settle & it then read 180kg. I have the Towsafe one from repco. I'm not sure its accurate but couldn't be bothered to get an accurate reading but it did confirm my suspicions that the ball weight wasn't as manufacturer stated.
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