The RV antifreeze, although food grade, is designed to be static and normally is pre-cut. It does not have the features of a pharmaceutical grade propylene glycol that is designed to be moving all the time.
There should not be an issue with replacing the Dow Therm with a high grade glycol. As stated by Tapman, these power packs are not designed to overcome temperature issues in the keg cooler. Maintain 38 F as best as you can and then dial in the glycol power pack to 29 - 32 F with assurance that the pump is circulating correctly.
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