Look at the 7-pin diagram here:
Trailer Wiring Diagrams | etrailer.com
The pins at the 11 o'clock and 1 o'clock positions are the 12 vdc power and the running lights. These are the 2 you want to hook together. As mentioned above, a fuse is highly recommended.
Some folks have actually gone under the trailer, opened the junction box where the umbilical cord goes in, and they connect the same two wires with a fuse and a switch. Then they can just flip the switch and get the lights.
1988 Coleman Sequoia - popup (1987-2007)
2012 Roo19 - hybid (2012-2015)
2016 Mini Lite 2503S - tt (2015 - ???)
2011 Traverse LT, 3.6L, FWD
2009 Silverado Ext Cab, 5.3L, 4x4, 3.73
2016 Silverado 2500HD Dbl Cab, 6.0L 4x4, 4.10