I would go with at minimum a 100 Watt solar panel if a trickle charge is all you want. Yes, they sell smaller panels but for deep cycle batteries they just don't do much. I would only worry about connecting to the house batteries, the chassis battery is usually separate and has less parasitic draws.
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John
2016 Thor Hurricane 35C with pups Piper and Annabelle
2013 Ford Fiesta toad
FMCA - F457085
Blog - https://traversity.us
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