To get it accurate and to be able to use the data from scales properly you need to get a consistant contact patch between scales and car... standard tyres are too soft and corrupt results
for full size cars with slicks we inflate tyres to 80psi all round to make them hard enough to give good readings and so its consistant.... plus they are kept as set up wheels/tyres and not used for anything else other than weighting or geometry set up.
if you had some set up wheels with solid rubber rings to grip scales then it works... i've tried to master it a few times but couldn't get it accurate enough to work like 1:1 scale
I've found that balancing wheels after fitting tyres on offroad cars is more beneficial and does make the car more consistant and jump flatter, it doesn't take much vibration to throw the handling out or the car to one side when its in air!
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