The good news is if the fridge is your primary requirement for AC power, the typical 6 cu ft Norcold fridges Thor uses only requires 3A @ 120VAC, which is around 400Watts or less.
Your engine alternator should be able to keep up with that kind of load.
Last summer I used a portable Honda EU2000 genny to power our RV for 4 days; we were boondocking at an air show and they only allowed quiet generators... kind of ironic at an air show, but this was for night-time use.
I ran our genny at night, and those of you that have a Honda EU2000 know that in economy mode, it is really quiet with light loads. I noticed this with the fridge running, which kind of confirms the light load.
However, when we plugged in our coffee maker in the morning - wow! The genny kicked in at a high speed. Of course, anything like a coffee maker will take a lot of energy.
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The only thing that works on a RV is the owner...
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