This is a Trucker 1 rub rail ladder. I had this ladder for my Flatbed but no longer need it, it’s a great like new light weight (22lbs) aluminum ladder that will save your back and legs from jumping up and down on your flat bed. This is the 3 rung version with the dropdown rung not the 2 rung with dropdown rung.
The Trucker 1 ladder is designed to assure the user has three points of contact. Ladder 3 wide plank rungs have a aggressive slip-resistant tread and two folding handrails. The ladder mounts in the stake pockets or rub rail of flatbed trailers. They sell for $558 new on Uniquetruck
$350 firm, I can meet you anywhere in the Greensboro Triad area in North Carolina
• Weight: 22 lbs
• Dimensions (Stored): 21" W x 37" L
• Dimensions (In-Use w/Handle): 21" W x 71" L