The only way to completely kill the power to the T&B is to remove the power cord and disconnect the battery cables. Most T&B owners install a battery cut off switch. It is an easy and inexpensive mod. Cut off switches can be purchased at auto parts stores. If you are not familiar with them, go to YouTube and see "installing a battery cut off switch".
For those of us without a cutoff switch pulling the fuse from the line connecting the battery to the trailer is an easier solution that disconnecting the battery cables.
San Francisco Bay Area 2013 CS-S us@gi 2015 Toyota Tacoma PreRunner Double Cab
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2017 Toyota Tacoma with tow package
Pacific Northwest
Spare & bike rack on tongue, Renogy 100w suitcase connection, cargo & door nets, sway bar, wired rear camera, Norcold aux fan, front window protection, frame mounted sewer & water hose storage, Krieger 1500w inverter w/100Ah LIFePO4.
‘17 Honda Ridgeline RTL-E- 5000# tow cap, 600# tongue cap
‘20 Honda Pilot Elite- 5000# tow cap, 500# tongue cap
Huntington LI
2013 CS-S us@gi
2015 Toyota Tacoma PreRunner Double Cab