So, I have a Bear Vault 450 which is probably big enough for two people's food, if needed I can bring this.
Travis and Nikita does either of your stoves have a pot? We'll need a total of 3 (possibly 4) stoves with pots to make this work.
Three season tents are OK so long as the weather forecast calls for low winds and not much snow, however please make sure you have a means of staking them with actual snow stakes (you can pick these up at REI for about $3 each).
I also have a four season Hilleburg Nallo tent I can bring which can hold two and am planning on bringing a BD First Light which is a tight fit for two but can work if needed. So I'll have tents for up to 4 people with me and an Ursack for me, one stove with pot and bear canister which should work for 2 others.