I mean, it's not normal for tires to go boom... so end of thread? Lol
That being said, I don't know how toasty it has been in Texas lately and I also don't know what your tire pressure was at the time of the incident or if you had been running that tire for a long time at low pressure (I would assume didn't mention a TPMS light, it was at least above 28-29psi). There is also the question of does that tire get curbed a lot? Did you hit a pot hole at some point with the vehicle? Any of those could have compromised the tire's integrity and combined with heat and speed caused it to give out. The picture shows what looks to be a sidewall rupture, so less likely something punctured it unless it caught the sidewall, so I'm leaning on something trauma related to the tire.
Or it could just be a faulty/defective tire that after 3yrs of Texas sun, 85mph carpool trips, and such, just gave up the ghost. There's lots of reasons it could have blown out, some of them more "normal/expected" than others; but as long as you're okay and the 4Runner is okay, I'd chalk it up to unfortunate probability?