Scale mostly denotes wheel size and driveline "beefiness". In fast RCs power system too (e.g. 1/10 uses 2-3s, 1/8 uses 4-6s).
1/10 short course trucks are MUCH larger than 1/10 touring cars for some reason. Real SC and Trophy trucks aren't that big.
Rarely is the "1/10" accurate, which is no...