explorer 8.8 in an a-body: experience needed

I am by no means an expert, and I am not trying to fan the flames, but could both of you (ab7fh & supershafts) be right? If the brakes are designed to go xxxxmiles on an a-body and the same on an xploder, thats assuming that they are both rated the same, the exloder weighes probably 20-25% more than an a-body. That being said, would the rear brakes not last 20-25% longer on an abody? They would not have to do the same amount of work on a lighter vehicle either, may not work as hard as they were intended on the originally designed for vehicle, but if they did, might cause rear lockup on a lighter vehicle. I dont honestly know if this is the case or not, but would love to hear others thoughts on this. This is the reason I went to a drum brake 8.8, being that they are both 10" drums I figured that it would be an easier swap with existing brake hydraulics on the car.
Rick