Not off hand, however, you have a few options. With the camper connected to you tow vehicle. Put the vehicle in reverse(without the engine running). Needless to say, parking brake on and chock the tires. This will give you 12 volts at the reverse lights. Use a multimeter to probe for the hot wire.
Option two. Take a light off the camper and trace the wire color to the reverse light socket.
I chose option two as I snuck the wife's for the camera in there as well, then revealed the whole area.
2017 GMC 3500 Denali HD
2010 Rockwood Signature 8316SS