Right here we go.. my car has gained a few kilos... I thought if I wanna do this properly I need some unknown numbers. So I chucked a subaru box and rear subframe in (because I was also curious how much that'd weigh too 
so I suppose you could say these are nissanubarus figures almost
These scales on their own take 136kg apparently. I dropped a corner on one scale to see exactly how much it would take. Turns out they max out at 152kg (all the way round + 4 stone) but there was no damage to the scale even after loading it with 200kg plus (was 220 but I don't know now ) Bonus points that we can't break them
Moving on... first things first.
Mark the centre
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You'll need something to place on it to spread the load of weight evenly on the scales
Its one pic per post so I'll say see pic 2 and add it after
Once you've added that zero your scales if not make not of the weight displayed.
Find something that will hold the other 3 corners up at the same height. Chunks of wood, slabs etc all work well.
If you can't don't worry too much its less accurate but as long as it consistent that's all that matters (I didn't bother)
Jacking one corner means you'll get more weight on the scale
See pic 3 how weight distributes
Now jack the car up safely and lower it down onto your scale setup. Keeping the centre of the tyre over the centre of the scale
See pic 4
Do this for all 4 corners and note your weights down
That's part one
