I don't have a special extra-long rack for this bike. I've got two racks on top... a fork mounted rack and one that doesn't require removal of the front wheel.
I tried both. The fork mounted one for the ride in was a bit of a stretch. With the back wheel hanging off, the bike dropped enough to make the chainrings hit the rack tray. It was very sturdy. I just didn't like interference with something as crucial as the drivetrain.
On the way home, though, I locked it onto the rack that keeps the front wheel on (the pic above). This actually worked really well. I could secure the front wheel, frame, and the back wheel was just close enough to be snapped in. I then tossed a strap over the top and cinched the entire FreeRadical down to keep everything snug. Overall, I'm very pleased with this set-up. If I ever have to transport this bad boy again, I know it's quick and easy to do.
Get out there.