I find it very different to control a rolled up log of a large quilt. It is, for me, easier to move a scrunched up mass. I did once roll a log and keep it on my shoulder - but I hadn't learned to scrunch yet.
This isn't the largest quilt ever, but it is a nice video about a way to handle all the bulk.
http://www.youtube.com/watch?v=7-eOpPsecyU&noredirect=1
I don't have that nice of a setup- I put a cardtable behind my machine and an ironing board to my left. Supporting the quilt is very important though!
There is a good craftsy class on quilting a large quilt on a small machine.