Actually those magnetic trailer lights
saved our bacon when we went South to pick up our Scamp
. I had taken a set that I already had and knew worked on my truck's 4 pin plug. When the 7 pin plug didn't immediately work, darkness was falling and I had 300 miles to go, I threw on the magnetic lights
and away we went.
I'd probably advise anyone driving any distance to pick up a "new" trailer to take a set with them. There're cheap insurance against a time wasting delay trying to figure out why the trailer lights aren't working.