Well, now we're getting into it. As Kirk points out, the rules are presently in individual race supps and not standardized from race to race. What's good at one race might not be acceptable elsewhere. There is a movement afoot to standardize and include in the GCR in the future. Terry Ozment has asked some people for input. That includes the safety aspects as well as what can be done when and by how many.
Personnally, I feel that the most dangerous crew job in an endurance race is fueling. I would not scrimp on protection for the fueler and fire bottle person.
Regards,
Chuck