J Rod, I don't secure mine for travel and it hasn't fallen on my head, yet! I through bolted the bracket to the plywood before installing it. I then mounted and locked the TV to the bracket so it could not move vertically. I then installed the plywood with TV attached to the cabinet. There are 3 very strong screws top and bottom holding the plywood. Before doing this I did reinforce the wooden mounting pieces that the screws go into. 18 months now and no problems.
I also keep my front tire pressures at spec for my axle load (95psi) which helps reduce the jarring you get hitting potholes etc.
John and Mary Knight
2015 Ventana 4311, 2015 Cadillac SRX