You will be arriving tired and a little bit cranky and the pickpockets in the Metro are fairly active, and they do not look like pickpockets, if you know what I mean. My wife was targeted by two women and the main operator, a guy with a suit and tie looked more like a doctor. Even a bit elegant in his nice white shirt, modern glasses and his coat folded over his forearm. I cut into their act and in seconds they went after someone else. And we only had a small suitcase each, but the train was packed.
Spend the money on the van, it will save you a headache. Pretty professional drivers even though they tend to smoke a bit.
Good luck.
Juan A.
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JA