Haven’t tried one myself but 2015 Kris Holm 26" and 29" unicycles come with 3" wide Surly Knards which Kris himself says are surprisingly nice on pavement.
I built a second wheel instead with a 700c Rhyno Lite rim to fit the frame and use ~40 mm wide tandem/touring tires on it, Panaracer Pasela etc. That’s my go-to ride and it’s lots of fun on non-technical unpaved stuff too. I save the wide 26" wheel for real muni, Maxxis Ardent or Schwalbe Hans Dampf SG for that. I seem to be the only one going that route though.