Infinite scrolling for the category

I can understand that.
But here, you’re basically using categories a way Discourse isn’t made for if I understand Falco’s message.

I don’t know much about discourse development, I’m probably stating the obvious, but your category hierarchy seems, however, perfect for using tags and I guess it would completely resolve your issue (unless you have a particular issue with tags?).

Here, you could have this kind of hierarchy (category → tags):

Chevrolet

  • Camaro
    • #Camaro-II
    • #Camaro-III
    • #Camaro-IV
    • etc

And so on for Cavalier, Corvette…