my TV has one of these
http://www.ebay.com/itm/Trailer-Light-Converter-3-to-2-5-to-4-wire-w-5-amp-built-in-Circuit-Protect-/370578657851this allows my separate amber turn signals to be integrated with the brakes to light up the red stop and turn lamps on my pop up.
Depending on your TV (if it has amber turn signals or a separate red bulb) you have the same thing. reduces the wiring harness from 5 to 4.
If your new trailer lamps have amber turn signals you would have to rewire it from your TV.
If you have the converter installed you could simply remove it and run all 5 back through a 5 or 6 or 7 pole harness. Which I wouldn't recommend if you haul another trailer the lights wouldn't work right.
Maybe tap into it before the converter and leave the4 intact and just run another connector. of course you have to then run a yellow wire all the way back to the tail.
If your TV just has red stop and signal lights through a dual bulb you need to tap into the brake and turn signal wires and run them back