Just a sidelight to the discussion, some MH's have power already routed to the 7 pin connector. (black wire, 1 o'clock position) This can be used for charging a toad etc. Sometimes, people fail to put a diode (one way electrical valve) in the circuit when they wire up to their toad battery. Without the diode, the 12 volt power from the toad battery can flow back into the MH and on certain makes/models it will allow the engine to keep running despite turning off the key! Monaco brand MH's specifically will do this, others may.
So, if you wire up your new toad and then can't turn off the engine of the MH, now you know why.
Ken