Roof leak: mold concern?

We have a 2002 sunline camper. It’s had a small roof leak for a few years. Seems to be getting worse. There is definitely water between ceiling and the roof. It fills up the light fixture and once during heavy rain, some began to drip from ceiling seams.

How do I tell if there is dangerous mold? We have continued to use it. A repair person told us to fix roof would be more than the camper is worth and not worth it.