A regular two-battery switch just routes power from the batteries to your trailer. You'll have to come up with a different switch setup to route power from your solar panel to the desired battery.
Going for simplicity, I'd leave both batteries hooked up all the time, with full-time solar. The solar will help provide trailer power when needed, and charge the batteries during low power demand times.
The only reason I'd use a battery switch was if I wanted to save one battery as an emergency backup.
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-Scott, DW, DG, DB, and DD
2011 Passport 2590BH
2009 Ford F150 SuperCrew F X4 5.4L w/Max Tow
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