keeping motorcycle batteries in toy hauler charged

pbbrgr wrote:
Sounds like the mistake I am making is not disconnecting them. So when connected there must still must be some electrical drain occuring even if the ignition switch is in the off position?

Yeah if your battery is flatlining in a month of sitting something isn't right. Bad battery or a draw that shouldn't be there. Check out your batteries and charging systems before rewiring the trailer to accommodate a charger.