We live just north of Houston, TX and have a 5th wheel with residential refrigerator with ice maker and a dishwasher. We don't get really cold weather on a regular basis so I don't use the pink antif...
If your only going to drop below freezing for a few hours your likely not going to have issues. It takes a long time below freezing to damage pipes inside the rig and you can always turn on your RV furnace as additional protection.