Ping pong table is great idea.
I use my 2x5 ironing/cutting table which is at countertop height. I roll the quilt and the backing up on those long cardboard tubes from the fabric store and clip, or just carefully fold. I cover the surrounding areas of the room with sheets so I can't make a mess, and I avoid overspray onto the front of the quilt by holding cardboard over it while I spray. I spray an area about 6" x the width of the quilt, then move the process along. Sounds wierd maybe but it works!