Mike:

If you haven't done so already, think about an escape route. This is especially necessary because your counter/stove area, door, and the widest opening of your roof are all in the same place. If something is going to catch fire (Heaven forbid!), chances are it will be in that front area, near the propane tank and you won't want to go past (or over) that area to get away. Most trailers with only one door have a window that can be bumped out. I can't tell if your windows are big enough to crawl out of or...?
Also, you've probably already thought of this one but, in case you haven't, you'll want a removable panel in front of that resting assist bar so you can get at it should it malfunction as it looks like you plan to place it inside a wall area.