I had problems with Toyo z800 ultras last years.Maybe they had a bad batch.Same thing.Bulges where the tread was seperating.We put on new tires of the same type and have had no problem since.
I only ron LS tires on all 4 of my rigs.Because weve had good luck and good service with tghem
We deal with the O.B. store in Lonbview.
Sounds like a lot of L.S. places are having problems.Hope it doesnt soread down there.

The deal with replacing calipers when doing brake jobs is that if you get a scar on a piston or cylinder.or even some dirt in them, when you compress the pistons they could stick with the brakes pressed against the rotor.
It doesnt happen very often.But I have seen it a few times.Its all about the gaurantee.If the replace the calipers.turn the rotors(to eliminate vibration)The will have less cahnce of problems down the road.ie,peop[le screemin mad because they are stuck on the road with the brakes stuck on or worse yet 1 brake stuck on.Have you ever had 1 front disc brake grab,and not the other.I've seen serious wrecks caused by it.Once again its the warranty and liability issue.
That given I always do my own brakes.But hardly ever redo the calipers.I do turn or replace the rotors though.