Be careful however, as the panel will swing down as soon as the last fastener is released. In trailers, you will need two ladders. Position them near ends of horizontal tracks. Remove clamp in horizontal track, installed in step 7. 11. Using three men, roll top half of door out of tracks.
First man is positioned between tracks and supports panels when in reach.
Each of the other two men grab last panel as it comes out of their track and walk down their ladder. Beginning by holding door horizontal, tip it up on one end. Rollers on that end will then fall out. Place both ladders on the same side of truck or trailer. Carry door section out of unit, tilting it slightly to get by ladders and rear frame.