I worked in a trailer repair shop, and I have seen some 2 inch thick bolts snap in half after being reused once. Can't remember the grade but I know they were super strong. I know it all depends on the stress of the bolt at the time of fracture, but retorquing certainly can't help the cause. i call upon the plastic baggy experiment. you pull it and stretch it once, no problem, twice no problem third time gets super tight, forth time snaps. I would think in an offroading situation it ouwld be a bad call to use it MANY times, a couple would do well. In a highway car, I would say probably okay, but definately woudln't risk the trial and error because of the high speeds