Got a standard issue ruck recently and have been rucking in full OCPs w/ the ruck. I have done a 16, 12, and 8 mile over the past 3 weeks. My lower back has gotten progressively more scratched up with each ruck and the 8 miler was drawing blood. Typically most of the damage is done during the running period of my rucks (i do intervals). I tried to troubleshoot with shirt tucked/untucked, and boxers on/off. No boxers seemed to help, but wasn't too much of a difference with the shirt either way. I have a 20 miler this week and am considering throwing some moleskin over the scabs, probably going to hurt like hell coming off. Do any of you experience this, and what is the best way to prevent it?