What steps to take in this situation

Check the batteries connections. Company Driver? Call the repair shop.

 

Use the jumper cables in your side to hook up to 1st driver you can see that is awake?

 

If the truck has a battery cutoff switch make sure it didn't get flipped.

 

2nd this.

In my mind, NO LIGHTS mean that the dash lights aren’t even illuminated (correct me if this isn’t the case). From overnight??? What would kill the batteries from starting the day before to completely dead?
Headlights left on, fridge, alternator was not charging and the driver didn’t notice.

Check the date of the batteries. If they are 3-4 years old, I’d buy a new set. There’s no point in trying to jump old batteries. Should fire right up. Get that alternator tested too.

Luck in battle.

 

Exit the truck, scratch your head, then kick the driver's side front tire.
If that don't fix it, call for road service.

 

I’ve had 1 of 3 to go bad ( hooked in parallel) the bad one pulled the other two down, it could be the problem. It’s the pits when you’re out on the road,cold weather will tell you if you got a weak battery, check for bad connections or a disconnect switch first, possible try to get a charge on each battery after you unhook them ( taking off the parallel lines) using a battery tester will tell you if1 or more is bad. I change all batteries every 24 to 30 months on my otr truck and exchange them with the local truck or equipment. It saves me time and $ .