Have you had a look at this famous thread:
Granted, there are more than 400 replies, and it’s old so some tires don’t exist anymore, but the last couple of pages should give you leads.
I think the Maxxis Ardent is still out there among the popular unicycle tires.
I got myself a Surly ExtraTerrestrial and at 2.5", it’s a nice all rounder. It’s happy on the road and it can take a pretty high pressure. It’s also good on trails and light muni as its rather thick sidewalls are able to handle low and very low pressure. And yet the weight is reasonable.