The IROCK's do come in radial.
I had SSR's fairly similar, they were not to bad to balance. I would go with beads next time I buy a set though. They got harder to balance with age
I had a set of 39.5 bias and now a set of 42 bias. They have both been on a 5-6000 lb 1 Ton Tacoma that is more rock crawler than expo and while they didn't balance that poorly, they wear like butter. They have a pretty soft compound and just don't hold up under a primarily street driven truck. I don't know what your plans are but for a more expo style rig I would look at a Radial like the Goodyear MTR. That said I wouldn't hesitate to put another set of Iroks on my Taco.
If you have the money and don't mind replacing them often, run em if you like em. They are great off road, not bad on road.