EZ Loader Trailer Parts upright support bunk or roller bracket. The upright support bracket fits both bunk and roll trailers with 3" wide crossmembers. Overall height is 9" and the pivot bolt hole is 8.5" to the center. Bolt holes are 9/16" diameter. Several predrilled bolt holes for adjustability. Made by OEM EZ Loader in the USA from galvanized steel for durability.