both our 2014 Fiesta and 2014 Focus, towed over 50,000+ each, never have had any issues with 'battery' voltage - but I also use a very simple battery disconnect, mounted under the hood. Simple.
and, when I had both of my Blue Ox tow plates installed, I had the shop also add the integrated bulbs/wiring back to the rear lights - so, also, no additional needs for any 'top mounted' external lights on the vehicle while towing. The integrated power from the power cable from the RV handles the rear tail lights, as they are powered just like the rear lights of the RV itself. Easy.
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the Turners...
two Campers, two Electric cars
former diesel pusher traveler
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