Just like the West Indian schooner galleys except they were usually on deck in a little caboose. A tiller serves to steer and the mast rakes sharply forward. So after a day or four or five they get in from Mombasa, Tanga or Dar es Salaam or from as far away as Dubai and Oman. The crew unload the fifty or so tons of cement onto the stone pier by way of their backs. For this they get about a dollar a day.
Dhows are pretty beamy.
I imagine they can sail with little or no ballast. They've also got a heavy mat roof covering the hold and crew. No bunks, just curl up where you can. It's quite a sight to see them come shooting through the breakwater, get sail off and make their way into the fleet already moored. Some drop hooks as they sail in downwind to help get themselves out again or maybe they set there anchors later.