Lord of Irrelevance
I've got a Worksman Klunker I built and love it. HD wheels with 11ga spokes, 3 PC crankI say the single speed (less is more, maybe 3 spd on hilly terrain) Schwinn Heai Duti's or Worksman Industrial Newsboy's area about the toughest most heavy duty bikes you can find. Add some racks and baskets and maybe a cart if necessary and you'd be set to go . We use them out in the refinery I work at and they get left outside and used and abused more than you can imagine and they keep on kicking butt. The most common problem we have with them are flat tires but them bikes go through hell and you're going to go through tires on any bicycle if you use it enough.
Plenty of space for racks and panniers