There should be no reason for the combined systems not working.
With the RV plugged to the truck slide the manual brake slide, does the actuator make noise in the RV? If not I would separate rigs add 12V to the actuator to confirm it is working.
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2015 RAM LongHorn Dually Air ride Aisin 4:10's
2016 MS 39TKSB3 "Highly Elited"
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