I'm on the same team but that doesn't mean I have to agree with you. :-) I've run IT sprint races and 3 hour enduros and never encountered a cracked rear drum. Lots of cracked front rotors but the rear drums have never really been an issue. I do know other Z racers who have cracked the lining of the drum but they've admitted to turning the drum beyond the minimum stamped on it before the event. Maybe the tracks and driver's here on the west coast are easier on brakes, maybe we run different shoe material, I don't know. You do know that a complete rear drum, shoes, backing plate, springs, wheel cylinder, etc. weighs in at 12lbs. 9.3 oz. right? You're not going to beat that with any disc brake install. And yes I've make a shoe change during a mandatory 10 minute enduro pit stop. Its hot but it can be done by two people if they practice, the drums are modified with two 1" holes to access the adjuster, and the adjuster linkage is modified. Also, having been on a vintage racing comp committee and dealing with Porsche guys crying "SAFETY" whenever they wanted a mod makes me very skeptical of anyone making a safety claim as part of a rules change. So, yes we're on the same team and no I don't think the rule needs to be changed for IT.