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Before starting the truck or anything in the morning, open the hood and put your hand on the GPCM on the RH valve cover. See if it's hot/warm. Had a couple that were killing batteries overnight.
Aside from that, which is the easiest thing to check, what dannyboy said - charge and test the batteries, but I would get them load tested with a proper AVR machine for a real world answer. A lot of the lighter/cheap testers will pass a battery when in actuality it doesn't have enough jam to wind over a high compression diesel.
Ford Senior Diesel Technician
2008 F-350 4x4 Off Road 6.4 Powerstroke Diesel
There are strange things done 'neath the midnight sun by the men who moil for gold.
The arctic trails have their secret tales that would make your blood run cold.