got an idea.
the scale readings are at their highest when one of the front wheel is resting up onto the higher platform scales while the other side is still on the floor below.
plus that 310kg reading was with 150kg worth of sandbags on both front seats.
to prevent overloading the scales initially, I jack the front wheels onto the scales without the 150kg sandbags. once the car is level and on all 4 scales, I check if the readings are within 300kg limit and then add the ballast if needed.
