The 400 has an option for a DC Norcold refrigerator that fits under the kitchen counter. You would have to measure to make sure, but I would bet it is close to being the right size. You may loose the drawer underneath.
I have the NR751BB that @Mickerly is referencing in our 2020 400 BDL and can safely say they work great. They are available off Amazon (what isn't?) for $851.00 plus tax, please don't ask me how I know.
There are other companies also besides Norcold, such as Isotherm, Truck Fridge, you can google and find others. Most on the forum would recommend using something equipped with a Seecop (Danfoss) compressor due to efficiency and long life.
I am attaching the owners and installation manual for the NR751BB as it provides the dimensions needed.
Brad
P.S. Norcold also has smaller models, the NR751BB is 2.7 Cubic Feet or 75 liters
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"Just Enough"
There are other companies also besides Norcold, such as Isotherm, Truck Fridge, you can google and find others. Most on the forum would recommend using something equipped with a Seecop (Danfoss) compressor due to efficiency and long life.
I am attaching the owners and installation manual for the NR751BB as it provides the dimensions needed.
Brad
P.S. Norcold also has smaller models, the NR751BB is 2.7 Cubic Feet or 75 liters
2022 Black Series HQ19 aka "Cricket"
2021 F-250 Tremor with PSD aka "Big Blue"
Concord, NC