The fridge I installed was a Norcold N3150
If you have a trillium
5500 , nothing comes off the fridge to make it fit.
The door and frame of the camper needs to be removed, and the fridge will fit with about 1/2 inch to spare.
I took the old fridge out first, then made a cardboard template of the front of the new fridge to find how it fit best for me.
I took about 4 full days to change it out, but ended up with a new, bigger fridge in almost the same opening without losing much space. I can send you a write up of how I did it if you want, send me a private message and I’ll send you a word document with lots of pictures