I can go with that, although I'd never have thought of it. Perhaps Ineos is taking this off road thing a bit too seriously?I assume this is what they're for.
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As an alternative, or second purpose, maybe it ties in with a roof rack and/or awning? Does look like a good spot to hang a solar shower.
Glad to see the Grenadier won't have artistic blanks (newspeak for blind spots) where rear side windows should be, something Rover found necessary with the Pretender's unibody construction. Gerry McGovern really is creative when he imagines we'll believe it's there for aesthetic reasons. The good part is that anyone can get that factory updated look just by painting big squares on their windows. Black roofs, Puma bonnets, metallic paint and sawtooth wheels have really caught on. That might be next.