no, I don't see any option where BitInstant can send TO dwolla
Also, Dwolla USDs are Dwolla USDs. So if you send the funds through BitInstant and they end up at Mt. Gox, couldn't you withdraw the USDs from Mt. Gox via Dwolla and then transfer from there to Camp BX?
If I remember correctly, Mt. Gox prefers that the USDs deposited turn at least once (e.g., used to buy bitcoins) but I don't think there is a technical mechanism that would prevent you from immediately withdawing any Dwolla funds that you've deposited. Though ... Mt. Gox already often has a backlog for withdrawals using Dwolla, so if you need this for arbitrage it probably wouldn't work. Maybe doing a trade, your MTGUSDs for someone else's Dwolla USDs, from there will work for you.
