You have to disconnect it or the battery goes dead, and jumping it can cause your dash settings to go nuts. Been there and done that with both my 2015 and 2018 Flexs. But I have the same issue with the Blue Ox brake unit, it needs to have power. I am going to use my big heavy battery jump unit and fully charge that and try it with the brake unit. It is also the back up for power for my CPAP with an inverter. Darned thing weighs over 20#, but it is the only idea I can think of. I put a RVi towed battery charger under the hood but that proved useless.
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