I think the OP is trying to install a hitch and the necessary wiring to tow a trailer. I think he/she is asking if they should tap into the Honda wiring for the trailer lighting plug, or should they just buy a kit that plugs into the wiring harness located in the drivers side rear inner panel and have everything he/she needs for the trailer plug.
I used the Kit, HOWEVER, I wasn't trying to wire up a trailer lighting plug in the Honda, but I was wiring the Honda CR-V so its tail/stop lights would come on when the motorhome lights came on. I also installed the devices that will put the Honda's brakes on when the motorhomes brakes are applied. And yes, there is a kit for that!
Ok, Clear as Mud? :confused2: You can get back to your evening coffee now! :coffeecup