Jonners - I tried a lever gauge on my car but failed completely. The problem was that I use deep profile tyres at quite low pressure so the tyres are quite squished onto the ground (please excuse the technical jargon). That meant I had to lift the hub up by something like 15-20mm to get the tread clear of the ground, putting significantly more weight on the corner I was lifting and the opposite corner. Checking all four that way gave a weight quite a bit more than the actual car!
Might work for stiff low profile tyres, but I gave up and bought corner weight scales.
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