Trailering: mast-head lights, flags
According to Wisconsin law (I'm sure it's similar in other states), we need to have, on the end of our mast, a light at night and a 12" square flag during the day, (https://docs.legis.wisconsin.gov/statutes/statutes/347/ii/20).
I can find magnetic lights, but I'm not sure that will work on the head of an aluminum mast. And I haven't found a red flag that "so hung that the entire area is visible to the operator of a vehicle approaching from the rear".
Does anyone know of a product or seller that has products for this?