If you are worried about the trip, fully charge the battery the night before you leave and use as little consumables as possible..if the fault is low voltage condition, you will most likely make it OK..
..or, if the roads are dry , you could unplug one of the front wheel sensors up near the shock towers , thereby dis-abling ASR/ABS...that will stop possible limp, but remember that you now just have reg braking and no ASR .
Personally, I would throw a voltage regulator on the alternator, just cuz it's cheap insurance and may in fact be the fault...and get the battery up full with a SLOW charge ....[ 24 hrs/low Amp]

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A Dalton