A rocker that is a SPDT, yes. Somtimes called an A, B switch. the common in the pic would be the hot (+)side of your cargo light, A/B would be the power supply.
Some lighted rockers have 3 terminals so the ground is also attached for the light in rocker, and those will not work for this...
Run a new power source with a single pole double throw (SPDT)to change power supply to the cargo lights. Then you can switch from the original power and your new power line that will keep them on.
I have been looking for one of these.
But when I use this part number it says "This part does not fit your 2021 Ford Ranger."
https://www.tascaparts.com/oem-parts/ford-heating-unit-gj7z6a051b
Keep the truck.
Take class in paintless dent repair.
Fix truck.
Start fixing other vehicles and make 2k per day. Sounds like you are in a good location for this.
That was the cost (ins. and deductible) to fix my mustang, guy did it in one day...
Just ordered some, thanks for all the testing and pics!
I drive at night often and when a passing car comes by I don't stare at their headlights. You should look at the fog line on your right, it will help keep your eyes adjusted to the night.
Are you getting glare because your windshield is...