So excuse this English major's ignorance about chemistry and all that, but is it actually plausible to come up with a list of every flammable solvent that a sleep-deprived mechanic is likely to accidentally stick in his pocket on the way to raceday? We can say 'nothing with an NFPA flammability rating of a 3 or 4 near your tiny girls strapped down in an enclosed space you idiot' but what if your drunk flagger leaves his flask of Everclear in your toolbox or someone brings out a jar of Crisco to make waffles for the pushers?
I'm just not really convinced that making a list of what you can and can't bring to raceday is the best solution, both in terms of making the rule(s) simple and clear and in letting the fire marshal have his say in what's safe and what's not. I think encouraging, or even requiring a pre-truck/raceday review with Sweepstakes and the Fire Marshal sometime between fire safety training and truck weekend, going over any possible combustibles and heat/flame sources that you may or may not bring to the course, would remove a lot of the ambiguous parts of the rule.
In general, I think the fire safety training session could be revamped and made more relevant to buggy; I've been to it three times, and I mostly slept through the Powerpoint because it was 20 minutes of FMB talking about the different types of fires and fire extinguishers (Crisco-spilling incidents aside, I don't think kitchen fires are relevant to buggy), then a quick retelling of the ATO fire, and then off to the super-exciting 'set things on fire' portion. It's kind of obvious that FMB's presentation is the same one he gives to everyone else on campus that requires fire safety, and also never really left room for conversations like 'if I bring a heat gun to toast marshmallows for my driver, can I also have a cardboard box full of buggy books and raceday shirts in the truck?' unless you approached FMB afterward and asked questions specific to your setup.
I would venture to say that no one would intentionally create a potentially fatal fire hazard in (or "near") their trucks, and that non-compliance with this rule is due to ignorance of what actually constitutes a fire hazard; that said, I do believe that creating such a safety hazard on raceday is grounds for instant disqualification (both to punish teams who would intentionally risk sacrificing the safety of their teammates for the sake of a stupid race, and to be a firm enough kick in the ass for a team that was just negligent, because you shouldn't be negligent). Ignorance can't be fixed by adding another 20 lines to a 500000 page document that the vast majority of buggy participants will never read, but it can probably be helped by actually teaching people what sort of things aren't acceptable for raceday. Or at least having FMB communicate to the teams whatever internal metric he's using to judge these things.