The model you are looking for is the Montana High Country 334BH.
MHC's come in 2 models, the standard RV refrigerator model and the residential refrigerator model. The models are identical except one comes standard with only 1 battery and the RV frig. The other comes with 2 batteries, an inverter for the refrigerator, and a residential refer.
The lower number is always the RV refrigerator model. The higher number is always the residential refrigerator number.
Here's a link to the 344BH model at the first dealership that had one when I searched the internet.
Click here (But it says this model has been discontinued. Maybe you can located a used one.
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2019 Montana High Country 375FL
2014 Chevy Silverado Duramax, 6.6L Dually