I would say at least 100 Watt depending on how much sunshine you get and it would be wise to choose a chargecontroller and wiring that can handle a second and third panel for future upgrades. Btw. it is cheaper to install more solar than to replace dead batteries.
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2018 RAM 5500 Laramie CC
Sold: Riverstone Legacy 38RE, 960 Watt Solar, 6x6 Volt AGM Battery Bank, Freedom SW 3012 Inv/Charger
Ordered: 2021....
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