Nitto has up'ed its Brompton Rack game by designing and manufacturing the Brompton R5 Rack for Brompton Folding Bikes. It's classic Nitto in that it's built to be truly bomb-proof. Using chromoly tubing that is hand brazed assures it will outlast the biggest loads and the meanest baggage handler. The U-shaped double struts give it a nice stiff mount to the bike and the bouncy rear wheels give it a nice roll even on an uneven, coarse sidewalk.
If you're a go-durable-or-go-home buyer, this is definitely the rack for you.
Mounts easily onto "L" and "E" equipped Brompton bicycles.