I checked with Remco and yes, their braking system requires a connection to the cigarette lighter, which will not work towing a Ford Focus with the battery disconnected.
Thanks gbopp, I followed your link to readybrake.com and the system looks good, and much cheaper than Remco using Blue Ox products.
Thanks mowermech, I found the Ready Brute Elite. Not sure where we go, but it can’t hurt to have the braking system. Remco wants almost $1,400 for their Blue Ox. The price difference with Ready Brake with and without the surge brakes only seems to be $400, a reasonable cost to be sure we don’t break any laws now or later.
LOL, at 68 I’m just not into the new slang, had to look up AFAIK to find it meant As Far As I Know LOL.