My 2017 29RKS doesn't have one either. When not hooked up to shore power, I use a batter tender, if the trailer is going to sit for a few weeks (which isn't often). During winter months also. Also, the electrical conections to battery are "wing nuts", prettty easy to disconect.
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2017 29RKS
2018 Ford F-250 Lariat, 4X4, 6.7L PSD, SC, SB
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