Look for a used Burley or Chariot from the last decade or so.
5 is awkward, they are not really great at riding yet but they don't fit in the accessories any more. You can maybe put the 1yo in a kid seat and the older kid in a single trailer. But to me 5 seems pretty big to fit in a trailer lengthwise, never mind sitting next to a 1yo. And he's not going to ride there for long before he's good enough to go the distance... it's only a 15 min ride. It might be time for a different idea.
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Genesis 49:16-17