Found a handful of forums (Australian) and Tank Net that indicated they might be able to hold two troopers. All agree this never happened. They pretty much indicated it was for spare ammo (Remember we're talking 76mm rounds.), fuel, water, rations etc. One trooper said while serving he came across one crew that had a microwave in their MRV. I suspect that's why the official Army Museum had them as C3 Commander, Gunner and Driver. My picture is from further back and might offer a different perspective maybe. It's also from the FSV.
Pic:
Regards,
Pat