Another trick I saw (but haven't tried yet) is to sandwich in sections (with plenty of overlap), quilt that portion (and the un-sandwiched 'stuff' is easier to roll or puddle), then add more batting - quilt that portion - etc. Gave me inspiration to quilt the king top that I was going to bring to the LAQ. There's a tute on here somewhere, posted with a video from Youtube.
ahh ... here's the thread.
http://www.quiltingboard.com/t-94447-1.htm