Sorry, but single role in an FSR union is not true representation- especially since you are the minority. First and foremost, FIRE departments are out to protect FIREFIGHTERS. By and large, they promote and fight for things that primarily benefit FSR, while occasionally throwing a bone to EMS. Yes, they are forced to provide medical care, but if you were somehow able to wave a magic wand and eliminate the medical portion of their jobs again(like the good ole days), most would JUMP at the chance.
It all depends on what you want to do with your career. It can be frustrating to be underrepresented, but if all you are looking for is a paycheck, benefits, a stable job, and doing something you love, that's fine. I don't know how old you are, but over time, working in a high volume area will take an emotional and physical toll on you. Once you are able to retire, you still want to be able to have a good quality of life. Sometimes that means moving up to a position off the streets. That's why so many single role providers become cross trained-not necessarily because they love fighting fires, but for longevity's sake. Changing locations/employers is always an option, but not always practical or even feasible. So many factors to consider- cost of living, pay, benefits, housing costs, etc.