I'm not a fan of inverters. IMHO, you should never use them to power a microwave or hair dryer or any other high power 115v device. However, if you have a good solar setup, you still need 115v now and then for things like charging your laptop, electric razors, maybe an outside string light, or an LCD TV that plugs directly into mains (all of these are less than 100W).
My converter and fuse block are mounted on the shell inside the "closet" in the bathroom. This makes for a very convenient location, especially because the outside 115V receptacle is available under a cover in that same area. The inverter is connected to the battery through the fuse block with its own 10A fuse (even though it's a 400W inverter, I want to limit the draw on the battery to less than 120W).
The inverter is connected to one of the sockets the outside receptacle, so I have inverter power available inside (one socket on the inverter) and outside. CAUTION: The inverter doesn't really have a neutral. You can't connect the trailer neutral to what you think is the inverter neutral or you will blow the fuse (some converters may not have this problem), so you have to break BOTH of the tabs on the receptacle so the socket connected to the inverter is totally isolated. The inverter ground, on the other hand, can be connected to the shell/trailer ground system.
Now I can go totally solar and still watch our small TV and charge the laptops (using an extension cord). And I can plug in our LED string light outside. Yay!
PS: Most gadgets these days can be charged with 12V
or USB 5V, both of which can be derived directly from the 12V
battery buss. The only thing you have to be aware of is that some 12V
devices treat 12V as their max and, as you may be aware, the charging voltage on a lead acid battery can be as much as 14.4V. So be careful connecting your 12V electronic gear directly to the "12V" system in the Airstream.
PPS: I cannot spell "receptacle".