Not sure what S you have, but my S has plenty of trunk space, if you pack the right stuff. Let me restate, if you have a carry on size roll on, it fits perfectly into the indentation. and you can load at least two duffle bags around that (if you really need that much stuff).
I also saw the comment about a cooler and found that if you get on of the old metal Coleman coolers (got my cooler in Gruene/TX and an Antique store) it fits perfectly into the indentation (a friend actually painted it for my Birthday in car color and I had at every S2K gathering people wanting to buy it from me.
Just to add last trip to Corpus I had the cooler a duffle bag and the S2K original cover in the trunk for a long weekend.
But guys, lets get back to the roots. All the space you need is on the driver size door the little net compartment is a perfect fit for 1, 2 or 3 credit cards and to answer your question FedEx delivers your stuff back home even on the weekend
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Have fun driving,
Franz