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More about a lack of knobbies and something reasonably puncture proof and durable. I've been using Schwalbe Marathon Supremes for the past few years and am happy with the compromise between rolling resistance and puncture protection (they even used to make a matching 20" tyre for the front). Obviously Marathon Pluses are great if you never want to fix a puncture, but they ride as if you were pushing through treacle.
Those WTB Horizons do look like an option though, thanks!
27.5 X 1.6" fits with plenty of space in the rear end of my omnium. Bit of a drop in bottom bracket height will take some getting used to with 175mm cranks. Anyone know of a 27.5 x 1.8" tyre that's cargo bike suitable?