usersmanual wrote:
I sell hundreds of trailers each year. They (TT)mostly come on transport trailers. The fivers are towed but the ELECTRIC brakes all and have always run off the transportation vehicle batterys. there will be a small auxiliary battery for the break away system brake ; we always install the required batterys on the PDI we do on every trailer that passes through our RV lot
Nobody is arguing where the power comes for the brakes, but it can't be towed without a battery because of the break away, so you get a cheap battery when it leaves the factory, regardless of how many it is supposed to hold normally.