When it comes to hanging a quilt, be it large or tiny, I use telescoping curtain rods. I especially like the smaller ones because they have those nice openings at the ends, where either a nail or a nylon fishing line can be threaded. I use 30lb test to hang most of my larger pieces, but then they require heavier duty curtain rods that don't have those nice little holes at the end. I have found that with larger heavier quilts, a little ease must be built into the rod pocket, which enables the fatter rod to hang without distorting the front of the quilt.
For really heavy quilts a flat rod like this is just great.
A loop of fishing line around each end, and a nail will hold most work nicely.
Just thought I'd share.