OK... not sure if anyone else out there is as obsessed as my wife at monitoring the temperature in the fridge, but we bought one of those indoor/outdoor wireless digital thermometers at Walmart and instead of the outdoor sensor staying outside of the camper to let me know what the temperature outdoors is, my wife has the sensor in the fridge all the time so she can "monitor" the temperature in the fridge.
So, with it not being cold enough for her (she freaks if it goes above 40 F), I read on how you can make your fridge colder and with our digital thermometer I can prove it to her. The fridge that came with our 2012 19RR has the thermostat (thermocouple, thermistor, whatever) on a plastic clip that clips the the metal fins. It shows to make it colder, you should slide it up to the top edge of the fins. However, it seems when you try to do this you run out of cable and it pulls out of the clip, etc. What you want to do is move the sensor further away from the "middle" (up and down) of the fins since the fins are the coldest at the center. Moving the sensor to the top edge is better than the bottom edge (slightly) just because cold air falls so while both the top and bottom edges of the fins are warmer than the center, putting the sensor in warmer place makes the fridge run more and get colder.
I read somewhere to simply take the sensor and clip entirely off the fin. I did this and actually let the sensor lay below the fins and though I mentioned cold air drops, just taking it completely off the fins is much warmer than being on a fin and the fridge will run more and get colder.
So, probably everyone already knows to pre-chill what you are packing in the fridge in your fridge at home if possible (so it doesn't take so long to catch back up), but moving the sensor off the fins does well too.
If you are up to more pimping of the fridge (I told you, my wife obsesses about her dairy staying cold), she also had me buy this fan off of ebay.
I saw the flashlight battery powered ones on Camping world, but didn't want to be buying batteries, so this one connects directly to the light switch. (Yes, there is hot 12V DC all the time, even when the light is off and the door is closed to this switch/light, so you can wire the fan so it runs all the time the fridge is turned on (Gas or electric... light runs off of 12V DC either way). Pretty simple to install, the seller provides pictures and drawings and this too will circulate the air in your fridge so everything stays closer to the same temperature and your wife is not moving the outdoor temperature sensor to different parts of the fridge worrying that parts of the fridge are not as cold as others!