I have a 40 and does us fine. Key is to rotate food and cool as little as needed. Thats my thing anyway.
My fridge is now 6 years old and never missed a beat. Waeco is well up to the job.
My next buy is a engel but as said before, thats another thread.
I like a fridge I can personally lift in and out if need be.
The bigger you go the heavier etc.
Personnel thing I guess.

