2020 Mallard IDM301 TV mount


Just bought this trailer and have purchased a Mount-It MI-431 mount for a 39" TV. I want to mount it in the living space where there is a specific place for it. My question is, what is the mounting section made of (MDF, plywood, OSB, etc)? And, what is the recommended fastener for this mount (lag bolt, moly-bolt, expanding wing bolt, etc)? Thanks for the assistance.