Some random thoughts...
I'm unsure whether a multi state category for trunked systems would be all that valuable - there aren't all that many of them. Perhaps a statewide trunk category would be useful - that should be something that can be done pretty quickly since there's a limited number of articles for them.
'Trunked Information''s original purpose was to capture data on a TRS that was not yet ready for the database, such as unidentified talkgroups or new custom tables needed for trunktrackers that had not yet been validated. It's probably evolved somewhat to handle things like RID/UID data and other things that the database can't handle. I think it still pretty much serves that purpose, but if there are other articles that don't fit into that mold, they of course can be moved.
When we're ready, some review of these categories is in order (to coincide with the previous discussions about renaming the aero categories) to clean some of this up. But I'd suggest waiting until I (and whomever else wants to jump in here) am done walking through all of the state stuff (I'm up to Kentucky). There are a LOT of articles that were simply never categorized beyond going at the state level, and we would be missing a great deal of data if we tried to do all of that now.
Once we have everything categorized, then we will have a handle on the scope and volume contained in the categories. Things will always fall through the cracks of course - we can't stop new development or modifications that other folks are making - but once this walkthrough is complete, we should have most of the categories fully populated.
I do feel confident though that the <statename> frequencies categories are pretty stable, though, so I think we can write them off of the list for modifications (and the cat tree) for now. They're specific enough that there's little question as to what they represent. That also goes for the regional categories - they're geographically pretty specific too
Mike