Before every trip I check tire pressure. During trip I use a small thermal temp in a key bob shape and check temps through the wheel spokes. I'm not so much worried about the actual temp as temp differences. My normal temps run in the 100 or less area depending on ambient temps. I've seen higher but I wouldn't be bothered by 160-180 on a hot day right after a long stop.
I normally tow 6-10,000 mi a yr. I adjust the brakes at the first of every year and more often if I feel any change. I repack my bearings every other year, which also requires new seals and brake adjustment. I visually check brake lining thickness at this time. I don't even bother checking magnets since I can buy complete brake assembly plates almost as cheap as shoes alone, and it's easier to replace the whole assembly.
I've not had a brake or bearing failure in over 30 yrs of towing doing this. As for tires I visually check them every walk around and closer upon bearing service time. I don't have a schedule other than replacing all of them when a problem appears.