Do you have a decal where to mount the TV? I have seen pictures of a white decal with red lettering indicating where to mount the TV.
I had a similar question on my 5th for the rear bedroom TV. I used a stud finder and the results weren't conclusive. So I sent a letter to Jayco and received the wall diagram. From the diagram I determined that there wasn't any appropriate place to mount the TV, so I ended up fabricating a piece of furniture grade plywood to the wall and mounting the TV mount to that.
Medium story short, you can get the diagrams from Jayco and have a look unless of course others have done this already