U-Bolts: To re-use or not?

Heat the nuts before removing them. Buy new lock nuts and use loc-tite. Never had an issue. Watched dad do it many many times in the late 70s thru the 80s on a fleet of chrysler taxi cabs - talk about an abuse fleet of vehicles.... they were running early 70s Newports and Furys when he start that side job. Went thru the Volare' and Aspen era and then the Diplomat/Gran Fury used police cars. Never seen a broken U-bolt. We replaced a ****-ton of rear ends in those 18 years.
Admittingly, that was all severe street duty. Depending what you are doing with your build, you may or may not want to replace yours......