Hey, if you have only one scale, do the following:
Make sure you can put the rear wheels onto the scales (my scale wasn't wide enough, so I had to put a bigger plate on top of it). Reset the scale to 0 with that new plate.
Then make something the same height as your scale+plate where you can put the front wheels on.
Weigh the complete car, for example it's 1620gr.
Then put the car with the rear wheels on the scales, front wheels on the other 'thing' you made.
Read the scales, for example 1050gr.
This means 1050gr out of your 1620 total sits on the rear wheels. Or 1050/1620=0,648148 or in % multiply by 100 so 64,8% of the weight is on the rear wheels.
Simple as that!
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