Tow Pro: ATM

Hi order a new van ATM was to be around 2400kg Car towing is 2500kg ball 250kg The van is finished ready to pick up The tare is 2107kg the ball is 164kg and the atm is 2577kg making it 77kg more than the car is susposed to carry were do I stand now can I get the 4wd modified to carry an extra 77kg or can I load it less to keep it legal. Or am I having to buy a new 4wd without the money to do so.