http://www.oldmanmountain.com

look at the sherpa

i just ordered one (they've been back ordered for a while) that should be in next week, and i'm putting it on a bike that is lacking some of the amenities and has disc brakes, so it should be a worst-ish case scenario. i'll try to post some pics.

it's expensive, but also supposedly bomb-proof and capable of holding whatever you want to pile on it.