Hey Ike...
I don't think a support vehicle is needed... even in bad situations, where you would break down and need parts/medical aids/etc., all you really need is a cell phone, some $$ or credit cards, and access to an area where you can have stuff mailed.
My idea on a very long trip like this would be to get where ever you were going, do plenty of sight seeing on the way, and then when you get there, rest up, and rent a UHaul truck for the way home if you didn't think you would make it. I REALLY want to go with you guys.. maybe I could meet you in Ohio for the trip???