A few comments. On many of the rear calipers, the caliper has to be rebuilt when the pads are replaced. This is not typically an issue with the front calipers. On any S10, Blazer, Bravada, Jimmy- the rear caliper always freeze after pad replacement on the original OEM caliper.
On many of these GM models, the inside pads wear at a much higher rate than the outside. I speculate poor pressure distribution.