Look at the Trojan range in wet cell and also look at an 80watt solar panel
to help your battery out a bit more. Wet cell give more bang per buck but be aware of fumes etc in confined spaces.
Not sure on your set up but we [mates] take an ice box for drinks and use the Engel for food ,milk etc.
That way its not being opened all the time, works great leaving plenty of 12v for camp lighting
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