I have never found that info anywhere either.
But, I have the same RV as OP and I have, in the 2nd from the front passenger side compartment, a full Craftsman 26" X 20" X 12" tool box, a bunch of other hand tools surrounding that tool box, some power tools, than all the liquids like oils and antifreeze, a few boxes of screws and whatnot, all in that one compartment and though I've put thousands of miles on the road, I don't see any signs that the compartment floor is sagging.
And I check that periodically. Like just now. It's fine.
I also used to own a '94 Bounder which had a pretty bad rust problem and the same tool box, tools, sundries and liquids rode in one of those compartments too, without sagging the floor.
My other compartments have not shown a tendency to give way either. The weight of the items in the two compartments under the LR slide (drivers side) are a bit less. I've got carpenters work stool, lumber, items for towing, 5 gallons of oil, hoses and the like in those.
So I would guess with the Journey, it's not too much of a worry. We also have those shelves in the passenger side compartments that should be able to carry even more weight because the floors of those are directly supported by the chassis frame rails.
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