Typically, the backup lights (if they are installed) are wired to pin #7 in the umbilial. That's the center pin, normally a yellow wire. If you remove the cover from the junction box at the pinbox on your trailer, you can verify whether there is anything connected on that wire.
Typically, in the past, Keystone has not installed or wired "backup lights" on their models. Recently they have been wiring backup lights on the "high end models". That said, installing tail lights with a backup light function doesn't necessarily mean the lights are wired or connected, so even with the newer Montana models, I haven't verified that the backup lights are functional.
You'll need to determine whether the "top worklights" above your rear door are wired to that yellow wire or not. If they are, they should function as backup lights, if they aren't (my guess is they aren't) then they are "manually operated lights" mounted on the rear and to use them as "backup lights" you'll need to turn them on at the switch.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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