Sandy, the installation of the LCD is not as hard as you might think. Most wall mounts are 4 screws total. Finding a rib to drill into is not that hard.
I'm not familiar with Coby. My Sceptre 20" LCD monitor/TV has been great. I've driven over 40,000 miles with it hanging on the wall of my MH and have had no trouble at all with it. I bought it as an open box return from 1st Wind of Columbia SC.
I bought a wall mount from an eBay seller. The attachment of the mount side to the LCD is an industry mandated (VISA) mount pattern with four small machine bolts. Once you have the mount on the LCD you marry two sides (wall mount ~ LCD mount) while someone holds it up for you.
Now if you're planning to mount it in a cabinet it gets a little more tricky but I'm sure with a little planning this is a DIY job for sure.
1984 28' Funeral Coach
Former Rolling Showroom & PuttLab (now party bus)
"I'm not an expert. But I did sleep in an Airstream last night."