On my Stryker:
The large AUX switch turns on an accent light under the trailer.
The small light up switches control outside lighting on the sides and rear of the trailer, like loading lights.
One of the small switches also controls an accent light around the ceiling fan. This one must you must pay attention to......the switch does not light up and you can not see the light on during the day, it is not very bright. I have left it on overnight after parking my trailer after a trip.
2020 Stryker 2313
2018 Ram 2500