You can go to JAYCO.COM and send them an email asking for your any and all of the build up for your trailer. All they used to require was your trailer VIN NUMBER... JAYCO has been known for very fast response.
Hanging HDTVs on the walls is not a hugh effort. What most folks do is hang up a small 3/4-inch to 1-inch flat board backing first and secure to the thin trailler walls with MOLY BOLTs - This larger board spreads out all of the weight. You can paint the added board to match your trailer decor.
May looks something like this....
Sample photos from GOOGLE images
Then you can mount the various brackets you need with standard wood screws. One tip is to find a mount that moves up and down as well as left to right. Some HDTV monitors when mounted high on the wall need to be tilted down for best viewing