Oversized Overland Cases?

[Jandy77]

I am trying to source an overland case that is at least 30" x 30", which will be used to haul/store spare wheels for my MTB bike. If not an overland case a cargo carrier would work. This would mount over the rear cab on a JCR half-roof rack. The pic is older so roof rack not shown. Does anyone know of anything?

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[Jeepasaurus_Rex]

I haven't really seen anything that size really. Could be worth making one on your own, though!
Any case can be an overland case