What are RV cabinets made from? Does this question keep you up at night, like me?

Most RV cabinets look the same. They look something like this (see below). What’s really going on behind that gray-gray-gray facade?

Fair warning: I sling around a lot of woodshop lingo in this article. I’m assuming you have a fairly high level of knowledge about woodworking. If you don’t know a thing about wood other than that it burns and it comes from trees, then here’s the short answer: