Спасибо всем ответившим. Теперь стало понятно. В принципе одно и то же шасси можно варьировать между классами, изменяя элементы подвески.
Насколько я знаю, техническим отличием трагги от монстра является наличие центрального дифа: диф - трагги, коробка - монстр. Имхо.
А вообще, есть машины, у которых трудно однозначно класс определить. Например, Traxxas Revo.
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