I'd suggests putting some full length boards under it, especially if it hangs onto a tailgate on a truck. Not sure its nessessary, but the extra support wouldn't hurt. Its helps in sliding it in and out if nothing else...
I help my buddy move a large tank (2' tall 3'wide 8'long) we put it in my Chevy Avy. Its was a Glass tank heavy as hell. It seemed like we could of done it with 4 people. But that was work, why not make it easy and bring more people.