Originally Posted by ODH
If you are concerned about the amp loading on the TT or TV change out 2 or 3 of the TT rear lights with LED bulbs. That will reduce the load significantly and allow for the additional load of the boat trailer lights.
A side benefit of changing out all your boat trailer lights to LED's is that you have no worries when dunking it into the lake. With standard bulbs, the temp. change can pop bulbs easily. Std. advice used to be to disconnect the boat trailer wiring before backing in. With LED's, never an issue. Change the rear TT lights too, and your overall current draw with the boat will be far below what the original TT had, without the boat.