Being refrigerated slows their metabolism and makes them logy and docile. So my suggestion would be to keep them in a well iced cooler.
That said: these are live critters you're talking about. I'm not going to go all PETA on you here, but you need to bear in mind how well you'd fare going a couple days without food or attention on a road trip. Generally you want to buy your lobster as soon as possible to when you're going to be eating them. The part about "not sure I want to eat them right away" is the most worrisome part of this. They don't keep. And you DON'T want them dying on you before cooking--that's food poisoning waiting to happen.
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