on my BFF1, one of the instructors was ripping into me because i didn't have a rural helmet, and he was saying that structural helmets are not suitable for wildfires. I don't know about him, but i'd prefer to have a structural helmet on my head if a tree branch hit me. as for having two helmets, that can be bad. 12-18 months ago, we got a call for a grass fire, upon arriving at the job, we found a small area of grass alight NEXT TO THE HOUSE THAT WAS FULLY ENGULFED IN FLAMES. had we taken rural helmets, we wouldn't have been able to go near the house. which is why structural helmets are the only ones we use.