13" of width adjustment on each side, guide height of 21".
Carpeted bunk boards provide proper center loading even in wind or side current conditions. Marine grade 2"x 4"x 60" boards are covered with deluxe marine carpet and mounted with an extra strong galvanized steel adjustable bracket. Can be mounted on top of frame for extra height. Hardware included to fit trailer frames up to 3" wide and 4 1/4" high.