The trucks I have use a deep cycle RV/marine type. Whether that is OEM or not, I don't know. It apparently worked at the time, as 2 of the 3 trucks have that type. 3rd is missing the batteries.
If what the OP wants to get takes an RV/marine type, then replacement isn't going to be too bad.
I just had a thought. You live in Vegas, it's sunny a lot right? Slap some solar panels on the roof. I know they make battery solar trickle chargers but who knows if they make anything beyond 12 volt. If you got it set up just right I would think it would keep the batteries topped off.
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