The Progressive Dynamics 5100 Series Transfer Switch, # PD5110010Q that you linked to will automatically reroute your RV's AC input from shore power to generator power when activated. While many manufacturers will source parts from the same supplier, the case that each unit is mounted in may be similar, but this is not the same item as available from Go Power simply relabeled.
I may not be fully understanding what your objective is but if you are wanting to isolate your battery bank,... view full answer...
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