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12.4 VDC is about 70-75% charged, so if you started with a full charge, then 8.5 hours in moderately cool temperatures discharged the batteries to near the recommended limit. A longer trip or probably warmer weather would discharge them further as the refrigerator runs longer. It sounds "do-able" in the current situation and maybe OK for a bit longer trips, even in warmer weather. I wouldn't think it would be OK for a 90+F day with a planned stop over at a WalMart parking lot.
A second thought, do you have the trailer batteries connected to the 7 pin "charge line"? If so, then you're really using 4 or 5 amps from the tow truck (not much more amperage can flow through that little wire) as well as the 25% from the battery bank, so the actual battery drain was a bit more than the 25%...
Anyway, at least it works for this kind of travel. Enjoy your trip.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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