Tom, we have supplemental LED bulbs in the original Trailhawk tail lights and signal lights I bet when they are on they don't pull a total of two amps but that is a guess. Candidly, the guy that installed my towing set up has been an independent RV shop owner for almost forty years and he said he would take care of everything and I guess he did because I have had zero problems with anything. Persnickety fellow with three helpers that are all about like him and they have a three bay shop. So, I really didn't question him about the specifics of how he was hooking up the equipment.
Trailhawks were hot off the press when we bought ours and there were not many in dealers hands. I went out to see this guy that did the installation and lo and behold he was working on his first Trailhawk that very afternoon. When I saw that he had the front end panels dropped and the tail lights all pulled out, I made sure my wife stayed up front and didn't come back into the shop area. The Trailhawk is her daily driver and she would have passed out if she had seen this sister to her Trailhawk so disassembled right then and there!
Your second question, no I don't travel hardly at all at night. I do run the headlights on the PC in safety zones and inclement weather but we take out early and shut down late afternoon. No, we don't run the headlights all the time on the highway. As I recall upon reflection, I think we did drive about three hours after dark one time coming home while towing this rig, but that was it.
This discussion is important to me. I am darn sure going to use my voltmeter on the upcoming trip and take those readings and determine the state of discharge of the Trailhawk battery. Quite honestly, since it has never been a problem I just never really thought through all these great points folks are making in this thread. I try really hard these days to suppress my anal engineering tendencies

Paul