Based on what you've said so far I think the most prudent strategy is,
Long term, save for the 5DIII. If you're at < $1k now, save that money and put it towards the 5DIII. That will be your primary camera.
Short term, shoot with your 6D until you have a 5DIII and then make the 6D your backup.
If if makes you feel better to have a second body while you're second shooter, rent one. Charge $60 more. Instead of keeping it in the case as a backup, use it as a second camera so you can switch focal lengths without having to swap lenses.
Long term, save for the 5DIII. If you're at < $1k now, save that money and put it towards the 5DIII. That will be your primary camera.
Short term, shoot with your 6D until you have a 5DIII and then make the 6D your backup.
If if makes you feel better to have a second body while you're second shooter, rent one. Charge $60 more. Instead of keeping it in the case as a backup, use it as a second camera so you can switch focal lengths without having to swap lenses.
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