Here's something we discussed on this QB a couple of months ago. Since then I've been basting my lap size quilts on the wall...yep, the wall. I put up a large flannel table cloth on the garage wall, secured with heavy duty (pieces) of velcro and using painter's tape a couple of straight pins for the top (usually 5) I spray basting glue on the back, smooth the backing on till I'm satisfied, then I spray the top portion of the top (seems easier than spraying the batting), and once I have the top portion all smooth I lift up the bottom and spray the bottom.
Oh, and b/c I'm short I place the top and bottom of the finished quilt sideways when basting on the wall so they are to the left and right (hope that makes sense).
This usually takes me about 15 minutes (and I'm picky) and it's wonderful...no for horrible back pain!!!
Hope it helps.
Sharon