We installed a Vizio E260VA in our 2012 2551. We chose the Vizio because of the slim design, front facing speakers and a sturdy back. The sound is very good and can be heard easily with the A/C running. There does not appear to be any flexing of the TV during travel. We have over 3,000 miles and are very pleased. The Vizio has very good viewing from any angle.
In 2008 we installed a samsung but were not pleased with the flex in the back or the viewing angle..
Here is a link to our orginal posting on how we installed the TV with a swivel mount: http://www.phoenixusarv.com/community/index.php/topic,713.msg4850.html#msg4850