Just added these

I think you are right on both counts as I've been looking through some dealers parts/wagon listings and found several different wagons listed that look the same, but carry different model numbers and pricing.  When I say different pricing I mean the ones with the single moulded set of 5 containers are lower priced and the other models - not sure if they have individual containers are nearly double the cost.  Unfortunately my Japanese is rudimentary at best so it could be the ones with the single moulded 5 containers are a budget model and the other if it has individual containers is a deluxe or standard model.  It wouldn't be the first time I've seen a manufacturer do something like that...