shocker that new ride is way nicer than your last one!! congrats!
i wired in bed lights to my dome circut. i did not have any luck finding the dome light wire at the fuse panel so on my 2007, i followed the wire down from the light, towards the rear drivers side, then down the drivers side cab, across under the seat...
i tapped it behind the drivers seat and just ran the power to the AUX lights from there. same would work for you. If you want manual on, then just roll the dimmer switch all the way up.
2007 XLT 4.0L Super Cab 4x4