A 100 watt panel will keep your batteries charged in storage but I would install a battery cut off switch close to the batteries to prevent any draw from your trailer.
During normal day use the 100 watt panel will tickle your batteries a little but won't keep up to your usage.
If you have a Progressive Dynamics Inteli-Power converter you do have a smart charger.
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Lenny and Ros
2012 Montana 3400RL,680 Watts Solar,4xT-105 Trojans,GP-ISW2000-12 Inverter,Trimetric 2020, EMSHW50C
2009 Chevy Silverado 3500 LTZ Duramax 4x4 CC Dually, Banks Speed Brake
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