2012 Silverado 2500HD Diesel

[V1GiLaNtE]

I always assumed second battery in diesel trucks was also because of running glow plugs on startup? Not sure how newer trucks do it but mine have about a 10 second wait time on start up, and if it's really cold you might have to hit them a few times

I should probably read the owners manual to see what the two batteries do. But there is an engine block heater intake saide if needed when it gets close to 0 degrees. Plug it in when I wake up and should be ready before I leave.

Damn, what type of fridge is that? I think I'm just going to invest in like an rtic cooler or something. Does it not drain the battery or wreck the alternator?

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ARB 50qt Fridge/Freezer. You could install a simple battery monitor and be perfectly safe to run the fridge all weekend off of the 2nd battery. ARB fridges have a built in smart circuit that can turn off the fridge if it senses that there is low voltage in the circuit aka low battery. Not sure what type of battery the 2nd one is, but if it's a deep cycle you're golden. Honestly, the CCA of any diesel truck battery is probably going to be more than sufficient for you to keep the fridge running all day in between the morning and evening driving back and forth to the track from the hotel.