Southpaw, just a suggestion.
there's a Roo section, under "Expandables/Hybrids" forum here.
you posted in the TT/5th Wheel forum's Rockwood section.
since your question is specific to a Roo 19, further questions would get more help in the Roo section.
most of the time, when this happens, there's a tripped inline circuit breaker along the tongue, between the battery and the front of the trailer. it should be able to reset.