So I have a strange wall construction in part of my house. I'm mounting an articulating mount, up to 55", in a stud.
I took out a cable outlet and box to see the construction because I wasn't finding any studs.
Starting from the room it's 1/2" drywall, 3/8" drywall, 1" foam, 2.25" actual length stud, then gap, then I think furring, then masonry exterior.
I'm thinking some 4.25" lag bolts into the stud will hold, but it's so bizarre I wanted to double check.