Would you mind telling me, what you would need? I'd suspect a running Windows 10 (would Windows Server be ok, too?) with installed 3DSMax. What else is needed?
I just took a short look at Google, they advertise exactly this use case: rendering for media and entertainment industry

You could rent up to 96 (!!!) virtual processors at once, together with say 50GB of space.
https://cloud.google.com/solutions/media-entertainment/use-cases/-----
Edit, found a better link:
https://cloud.google.com/solutions/media-entertainment/use-cases/rendering/-----
I'm sure, Amazon with its AWS cloud services offers something comparable.
I know, these processor power is not free of charge, but at least I would be happy to sponsor a rendering session. You could "offer" a sponsor link in the description of the lot?

I know that from park benches here in Germany.

The prices are pretty cheap, between $0,01 up to $3,80 per hour. If I calculate your assumed PC power and 27 hours, my guess would be around six hours, max ten hours, for the tanker model. Would be something around $15 to $25... As I said, I'd love to see a "sponsoring by model".
