My 2020 does not have one. We are full time so not needed but the one on my 2017 is great for keeping the batteries charged in storage. I hear people say they are worthless but mine keeps 2 6 volts fully charged as long as the battery switch is off. 10 watt panel is plenty to make up for the 4% loss per month.
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2020 F28 RKS Titanium
2017 Creekside 23 RBS Sold
2016 F250 Super Crew XLT Overworked
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