Temperature of the food you place in the refrig makes a huge difference in how fast it will get to temperature. We always try to place already cold food into the frig, especially when first starting out. Folks compare an RV frig to a home frig and they are not close to being the same. I agree about the fan, plus, we try to never open it all the way or leave it open for any length of time, takes too long to recover.
Good Luck. !
2011 Toyota Tundra double cab