I looked at it a bit more, and the IRA situation requires lending club to send money to Self Directed IRA Services, the firm that holds the LC IRA monies. I'm not sure exactly what that means, but I think I need to get SDIRA to take that money and send it to Vanguard FBO: me.
Cashing out will be one headache, and the rest will be only slightly less quick and easy as typical IRA to IRA or 401k to IRA transfer (I think)...