I've heard the term five alarm fire before Is this how the fire department gauges how dangerous a fire is? And what categorizes a fire as a five alarm, or three, two, or one.
USA I never heard of humidity adversely affecting the detectors. But, there is always a first time for everything. You might have dust or other contaminants coming in to the house when you open the windows, which might be setting the detector off. Are there any industrial plants within several miles? Many factories give off smoke and other fumes that set off detectors. Most detectors are interconnected, so that if one goes off, they all go off. If it really is the humidity doing this, you need to locate the one that goes off eratically, and replace it.
Low battery Dust Or insect. If not get a new one and put up where it belongs.
Blow them out with compressed air.
It looks like you have found the answer to your own question. Why would you want to run 30 series tyres on the freeway. I live in england (home of crap roads) and i have 205/45/17. My suspension on my car is almost non existant as its a sports car.BUT i don`t get bent rims.I think you may need to change your tyres to something a little taller than the 30 series you are running on at the moment.Can you not get something like 265/40/19 instead.These would make your rims a little bit further from the road and possibly save you from buying new wheels.
It could either be from the heat (OURS went off yesterday morning due to the 90+ degree heat and not having our A/C unit hooked up yet.) orit could be that that particular detector is in need of a new battery (as they'll sometimes chirp, or go off when they need a fresh 9V)