The easiest way to corner weight is 4 scales on a level surface. I use some inexpensive kitchen scales.
The results are not innacurate - but they can be a bit misleading. Because RC cars are built with larger "tolerances" (ahem) than full-size cars, you can end up with a different result every time you put the car on the scales. I don't get obsessive about the corner weights any more, but if I have one wheel that is, say 30gm more loaded than the others then I will give the car a good going over.
The scales are very useful for measuring weight distribution. Even though the corner weights can have quite a large tolerance, the left/right and front/rear sums are always spot on.
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