We have the MorRyde mount for the 23" flatscreen that we upgraded to. The locking mechanism works well, have not had it let loose in more that 3000 miles so far. The only concern would be the weight. I cut a piece of 1/2" plywood, painted that and mounted it with some wood cleats that i installed. Works good.
Goody Two Shoes and the Filthy Beast
2008 Chevy Silverado 2500HD
Duramax and Allison 6 speed
2012 Wildcat 282RKX
You can't make things idiot proof, you can only make them idiot resistant.