Exhaust pipe, cooling fans and venting pictures
These images show:
1) the exhaust pipe for the propane burner (I found a nicely-bent steel pipe from an old swing-set that worked perfectly) to vent out between the ribs. Everything is sealed with heat-resistant fireplace caulk, but the pipe will just pull out of the hole if I pull the fridge out.
2) the indoor supply vent as well as the access door open (the indoor supply vent is necessary when traveling or when the access door is shut).
3) the cooling fans above the condenser (4, 80mm computer fans). I will hook the fans up to a thermostat to control when they turn on and off.
In the photo looking down the back of the fridge (showing the pipe), you can also see the aluminum baffle, a sheet of aluminum that makes a solid, straight wall up against the back of the refrigerator. Prior to doing this, I believe there was too much dead air space in the curved part of the trailer behind the refrigerator and that contributed to my original overheating problem, too.
Now I just need to finish off the open hole with some kind of perforated metal grating, louver or vent material... well, and paint the walls, and fix the skylights and fix the windows and polish the outside and.... you know.