Okay, no one seems keen to respond, I'll add a little more information.
I've never ridden this distance before but I am sure I can do it. I have all of the camping gear that would be required to avoid hotel stays, and heavy use of restaurants.
I am imagining two touring bikes with panniers and trailers, or maybe with an xtracycle.
The problem I see is weight. I know from backpacking, and from reading about touring, that keeping weight down is often the key to comfort. I am not ignorant about bikes and would spend time and money to create as much mechanic advantage as possible. With this in mind how much weight can a fit person tow on a bike across 1,200 miles in a handful of weeks or so?