The TT is a 2012 x18D, the tow vehicle is a 2011 f150 sc eccoboost with max tow
there is no mention anywhere in the Manuel of a remote for the radio, nor do I see an audio connection at the tv site, just antenna, power and booster.
I'll check out the alarm function to see if that might have been overlooked.
Thanks for all the places to consider, I'll back track through the scenarios to see if one solves this. We do a fair amount of off grid camping and I don't want this to add to the load on the battery.