Trying to find a place to put a catbox in our 2203, anyone seen this done? I was thinking put a cat door into the space under the dinette seating where the heater hose is. Seems like plenty of space. My only question is how to get it to vent outside...

For venting to the outside , use a battery box venting kit with a flush mounting wall louver to clear the upper half gasket when lowering trailer
You could add a 12 volt axial fan into the venting kit on a switch to control odors
Make sure you seal off wiring and 4” heating vent from the cat area( the spot you want to put it is open above the fender well to the furnace return air and you would pull in odors into the heating system)

__________________
Les & Patricia
2006 22ft towlite (replaces 97 21TL)
2006 Toyota tacoma pre-runner 4.0 L V-6 quad cab
w/ 98 chevy Powervision towing mirrors
2017 Chevy Silverado 1500 5.3 v8 (replaces Toyota)
2 Hobie mirage pedal drive kayaks