I have converted a boat trailer into a log carrier by adding rolling bunks and an 8' Arch. The arch can move up and down on a pivot on the trailer and is controlled by a winch. There is a second super heavy duty 2 speed winch also on the trailer that can control pulling or lifting. The arch has extenders that can add an additional 4' to the length. The trailer is best suited for up to 18" logs that are about 10 to 12' long, anything more would be taxing the system. The trailer comes with papers.