There are a lot out there - random example is a kona sutra is pretty good - disc brakes, compact frame, sliding drop outs for rohloff speedhub use, braze ons for racks/fenders/3rd water bottle

IMHO - the better option is a cycle trailer (yak, bob, or anything similar) rather than racks and panniers

hope this helps

You could also try the second hand market and see what turns up - just make sure you get the frame and fork checked for damage before purchase