Do you have an inverter in your trailer? My '17 has 2 sets of leads into the trailer, one pair feeds the inverter directly and the other feeds the rest of the trailer loads through the store/use switch. Which means a) you can turn on the inverter when the batteries are supposed to be disconnected, and b) you can leave the inverter on to drain the batteries when the batteries are supposed to be disconnected. Not a perfect system, clearly.
Zero Gravitas — 2017 Flying Cloud 26U | WBCCI# 15566
He has all of the virtues I dislike and none of the vices I admire. — Sir Winston Churchill