I have run the exact same configuration from the TT battery with no issue. 
Pull power directly from the battery with both legs ( 12V and gnd) fused.  I
generally run about 40W as I have had little need to run more.  You will
need to monitor battery voltage so as not to pull the battery too low.  I
have not run from battery with power to the trailer as I expect some noise
from the convertor. If I have shore power, I run from my switching supply.



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