Hmf23-
Roadmaster supplies two connectors, as far as I know: one for the toad, and one for the 7-pin to 6-pin "umbilical" cable. I expect you're not asking about the six-pin connector on the truck, as there are no wires to attach to the brake controller and charge line pins.
Call me contrary. I suggest wiring all the wires in the 7-pin to 6-pin "umbilical" cable to their correct pins.
1) It's only a little "extra" work
2) Loose wires in a connector are an invitation to later odd wiring behavior (for example, imagine an ignition-powered 12V charge line "accidentally" shorting to ground inside a 6-pin connector)
3) You may later need a charge line (different toad, or your truck battery can't keep its charge)
4) You won't have to remember you did something "non-standard"
My experience is that the inside of hitch/cable connectors contain precious little room for the wires that are supposed to be there. It's actually easier to terminate them all, than to find room to insulate and double them back inside the connector. If you cut them off, to save the room, well... no putting them back later, without having to shorten all the wires.
Terminate them all.
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Mark
2008 Holiday Rambler Admiral 30PDD (Ford F-53 chassis)
2009 Honda Fit Sport
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