What's the plural form of four-wheel drive? Here's the word you're looking for.
Answer
The noun four-wheel drive can be countable or uncountable.
In more general, commonly used, contexts, the plural form will also be four-wheel drive.
However, in more specific contexts, the plural form can also be four-wheel drives e.g. in reference to various types of four-wheel drives
or a collection of four-wheel drives.