I have owned, used, bought and sold (was a used RV dealer) RV's for nearly 40 years and always ran the fridge on LP while driving and never had any problems whatsoever. However, if you read the owners manual etc., they probably say DO NOT DO THAT!!!!!!!! So don't do it based on anything myself or anyone here says, its at your own risk, its your choice not ours
That being said, if the 12 VDC option is available AND YOU RUN EXTRA HEAVY GAUGE WIRE BACK TO THE FRIDGE I would use the 12 VDC option as that has to be safer and manufacturer approved versus LP while driving BUT YOU NEED THE HEAVY WIRE FROM BATERY TO FRIDGE MIND YOU not any wimpy 14 gauge!!!!!!!!!! The gauge required depends on the length of the run plus the actual current draw.
Are you sure you have a good circuit and protection (fuse or breaker) from the truck battery back to the RV house batteries so they are charged when driving via the trucks alternator????????????? I ran 2 gauge wire from my engine battery (to and through the mechanical isolation relay) back to my RV battery bank and when driving my alternator keeps ALL the batteries around 14 volts subject to RPM and battery charge state. Then to operate your fridge on 12 VDC you need good heavy wire from battery to fridges 12 VDC input. Unless you have a problem (faulty isolation relay or too small wire or bad batteries) when driving the alternator should maintain RV and engine batteries with no problem, all of mine have... What condition are your RV batteries?? Ever have them load tested?? They may be weak if your alternator (subject to good circuit and wiring) cant keep them charged even if running the fridge on 12 VDC
John T Long retired Electrical Engineer and long time RV user
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