I leave the tow bar on the coach most of the time. I remove it altogether once a year to clean the stinger and apply fresh grease. Several years ago I had not removed the towbar for a few years and when I needed to for clearance issues I couldn't! It had frozen in place. It took an hour at an RV service center with two guys and cutting tools to remove it from the coach. They were able to preserve the receiver but nothing else survived. They had to start by cutting off the hitch pin lock. I guess when I get set up for a lengthy stop in two days it will be time to go through the exercise.
My lights are add on bulbs in the original light fittings.I use a 7 pin trailer pigtail with only six live wires. They include lights, brake and charging line. For short stops - a day or two I leave it all in place on the coach. For longer stops I stow the pigtail in the coach basement. usually leave the safety cables and breakaway just hanging there.