I have a Dutchmen 242RESL and when I talked to Dutchmen, they said there is sufficient backing there to hold a TV. Hint: Go get a fairly long piece of double sided velcro (enough to go around your television with 10 - 20 " extra and some fairly thick foam). Mount your articulating swivel first pinching the velcro (even lengths top and bottom) behind the mounting plate next to the wall. Install your TV onto the other end of the swivel and push it to the wall with the foam between the back of the television and the wall (this will save damage to your wall and television). Use the velcro now to hold the television firmly to the wall.
Hope I haven't confused you.