Well it finally warmed up a bit, and we have had a couple of days where it got just above freezing.
So I was able to finish the wiring on the backup light. The IPF wiring kit was great, although I did need to buy some extra wire to run the ground back down to the frame. With the ten inch ground wire in the kit they must figure the light will be mounted under the bumper? The wiring was strait-forward, although laying in the snow and ice under the truck was a bit painful.
(I ran the wire from the engine bay under the truck and along the frame to the end of the cab. Then up along the bed/camper and across the roof, wire is protected across the roof with a flexible wire tubing. I had six inches of wire to spare!)
I mounted the switch on the steering column. Easy place to switch the switch, and it had the necessary depth behind the switch for the bulky connector box. (Be sure to check placement in regard to tilt and telescope of steering column)
And the light works great! (Although it does not solve the problem of huge blind spots when backing up. So I am still waiting for the bumper "mod" that will happen when I hit something.)