flat towing - whos done it? pros and cons

We did it. I don't think I would again. We used some towing hubs made from AMC front hubs, so we didn't have to pull the driveshaft loose and tie it up all the time.
The primary problem, at least with our setup, was the front wheels would occasionally flop the wrong direction when turning a corner. Could be a bad thing if you didn't notice, cause you are towing with a motorhome.