Bit of topic but those pics are quite old. On the note of what trucks would be able to go through there, I'm not sure on the exact size but im sure if they couldn't fit then there would be other ways around haha.
The teams don't come through that side of the quarter anyways. IIRC, they enter the area through either the North/Northwest portion of Monaco through Albert Boulevard.
I don't see why a big truck would absolutely need to take that particular route, anyway. I can't think of anything along the water there that would require an enormous truck and that route isn't an artery to anywhere, so if you take a giant truck through there you're basically just doing it for the sake of doing it, or you've let James May drive it and he got lost.