I’ve used them on my CJ 7 with 33’s. They’ve worked well. From what I understand, they don’t do well with a vehicle that gets up to speed quickly. Probably why they worked with the CJ.
I didn’t use the real beads, though. I did the redneck version and used airsoft beads. Bought the big tub at wallyworld and split them equally between the 4 tires.
There’s info out on the interwebs of how many ounces to use for specific tire size if one wants to be more technically accurate about it.