use a stud finder to try to locate a stud. better yet is to contact Jayco w Make, Year, Model, Serial number and ask them for "a drawing showing where the backer board is" for the TV mount. I've heard that Jayco is very helpful in this regard.
Maybe someone can chime in who has that year model and take a picture of where the "Mount TV here" sticker that they put on the wall. Thats where the plywood backer board is.
2016 Jay Flight 34RSBS
2014 Ram 2500 6.4 Hemi, 4.10 axle
2009 Jay Flight 29BHS G2 -Traded in-
2015 Toyota Tundra 5.7 Crew Cab, Traded in