Hi Dean,

Crew cabs generally aren’t modified aftermarket, they tend to be new-build from the manufacturer (although, of course, there are exceptions to every rule). You can, and indeed are supposed to, register them for commercial tax, but one word of warning: if you do ANY social, domestic, or pleasure driving in the car, you’re going to be breaking the law and if you’re caught it’s a €4,000 fine. You can register any crew cab as a private car, though. It’s more expensive than commercial tax, but them’s the breaks.