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Isn’t there already legal definitions such as gross vehicle weight? I know there have been some edge cases where people argue cars as trucks to get special truck access for commercial use. Chevy HHR comes to mind with some contractors.
USA Light Truck definition: Firstly, the vehicle must have a gross vehicle weight–that’s the curb weight plus payload–of no more than 8,500 lbs. Secondly, it has to be designed to transport persons, property, or be fitted with special features allowing its “off-street or off-highway operation and use”.
https://www.greencarreports.com/news/1093696_why-your-car-is-a-truck-under-federal-law-and-what-makes-it-one