Jensen makes a nice system of mounts:
http://www.jensenrvdirect.com/products/lcd-tvs/lcd-tv-mounts.htmlYou can see the progression from flat on the wall, to single arm, to double arm on that page. You can sort of see the V-shaped bracket that stays on the wall when you remove the TV and the rest of the mount. In the past, you could buy just that V, to use as an additional mounting location for the TV. You probably still can, although I didn't see it.
I have the double arm MAF50 in our Sunseeker. It works well. I bought an additional V wall mount in order to make up something for using the TV outside the MH, but have not done anything with it yet. The idea is that I'll detach the TV and then hang it on the mount outside. I think it will be something other than attached to the sidewall of the MH, however.
I also mistakenly bought an entire extra MAF50.