Weight Limit on Toilets
I don't know the answers to your questions, but I can say that our fairly typical (maybe a bit better than average quality) floor-mounted toilet has stood up to a 400 pound relative for years with no problems except for the mounting bolts loosening up a bit, even though it doesn't sit entirely square on the floor. If the bottom edge has held up under these conditions, I would guess that the bowl could stand considerably more.
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