I've installed the very same (amazon) aux backup lights as blw2, also angled out... just a bit. 2 under the bumper of the pick-up, 2 under the bumper of the FW. Between the 4.. they light up the night.. when needed.
FWIW ?
I used a relay on the pick-up, controlled by the OEM backup light circuit. The light power is from a 10ga wire, pulled from Up-fitter switch #1.
On the FW, I hard wired them from the hot lead for the powered rear stabilized jacks... too the lights, via a waterproof switch, mounted on the left rear corner of the coach.