I have a couple of racks suspended from the ceiling rafters. Each consists of two thin planks, about 6' wide, spaced about 2' apart, and hang about 18" from the ceiling. These are covered with cutoff from old carpet tiles to give a nice soft cushion effect. The only thing to watch out for is the wheels, which dangle down to about head height [X(]

If I remember, I'll take a photo to show what I mean.