I would imagine most of us have changed over to LED lights to save on energy drain from the trailer batteries. Each of the incandescent 12VDC automotive type bulbs can draw a good solid ONE AMP of DC Current. Just changing over to LED inside lights was a hugh power savings effort for me. I know that was my number one priority.
The trailer lights you have referred to are powered by the truck 12VDc battery and will not give you any saving on energy drain associated with your trailer.
Having said this of course I have seen the STOP and SIGNAL lights changed over on some trailers and they appear to be alot more visible for approaching vehicles from the rear.
Most ALL of the truckers trailers now have LED stop and signal lights. Alot of the emergency flashing lights are also now LEDs as they are less prone to failure going OFF and ON as required.
Etrailer has nice selection of DOT Approved trailer safety lights.
There is another issue that some LED assemblies radiate alot of RFI signals especially the LED assemblies that have built-in regulator chips. However this being only activated when you are towing your trailer probably is not going to be an issue for you. You may however run into some of this with your already installed new LED fixtures inside your trailer. They may interfere with your HDTV signals especially when being received from the OTA BATWING antenna. ALot of folks have experienced this with the bedroom mounted HDTVs being closer to the high output bathroom lights I guess...
Probably a personal call on your part... I would put my money into more batteries first as my camping style includes camping off the power grids where everything powered up has to come from the batteries....
Just my thoughts
Roy Ken
My Posts are IMHO based on my experiences - Words in CAPS does not mean I am shouting
Roy - Carolyn
RETIRED DOAF/DON/DOD/CONTR RADIO TECH (42yrs)
K9PHT (Since 1957) 146.52M
2010 F150, 5.4,3:73 Gears,SCab
2008 Starcraft 14RT EU2000i GEN
2005 Flagstaff 8528RESS