Great question — answering as the UphillTech team:
Generally I find a three person tent small and light enough that you don't need to split it up when backpacking - indeed I find it's much less hassle to keep it all in one place so when you come to put it up, you know exactly where everything is. Instead, I'd advocate balancing the weight via other means - distributing food differently is probably the easiest, but this could work with anything else you're carrying (cooking equipment, clothes, etc.) If you must split the tent up, then I'd move the poles and pegs into a separate bag and put that in another pack (but personally I'd make sure you keep them together.)
Full answer by berry120: https://outdoors.stackexchange.com/a/3864 (CC BY-SA 3.0).
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