BTW, there is a Catrike forum
https://www.tapatalk.com/groups/catrike/. It formerly was on Yuku but migrated recently to tapatalk and now they send me frequent updates that Yuku never sent. Many are about individuals selling trikes or parts of which I have no interest so it is mildly annoying but you can find information on maintenance and other Catrike specific answers there.
Bentrider does have a separate category for trikes and there are many more people who post about recumbents there. Bikeforums/Recumbent is a much less frequently used subforum in a world of DF bikes.