Use a studfinder and search around. Remember, to find a stud you have to start the finder where there is no stud, so tap about and then draw out your stud pattern.
I found my studs, then mounted a good solid piece of wood with multiple screws onto the studs, then mounted the swing arm for the TV onto the wood. Worked great.
Also, I put a piece of cloth material with two ends of velcro behind the swing mount. I push the TV back against the wall, and then run the Velcro straps over it. It all stays on the wall when we travel.
Nothing like coffee and morning news on the TV in the morning.
Mike
2012 Winnebago Impulse Silver 26QP
2005 16.6 Double Eagle
2018 Jeep Wrangler JK
previously Snowbird Campers,
Triple E Motorhome and Fifth Wheel