Doors and hatches
White Trailer Door, No Window
Press & hold Activate to lock it or set a combination. Repair with a construction tool using the secondary action.
Harvest drops
Iron× 5-10
Taken apart with a harvesting tool (axe, pickaxe, shovel), before perks and tool bonuses.
Drops when destroyed
- Iron× 10
When it collapses
Falling, it leaves 
Scrap Metal Pile (75% of the time) where it lands.
Where to find (9 POIs)
Fort Choppa (tier 4), Shady Woods Amphitheatre (tier 3), Wildfire Camping (tier 3), The Sinkhole House (tier 2), Mercy Point Camp (tier 1), Bunker Buildsite #5, Car Impound Lot, Overturned Trailer, Transmission Station.
Points of interest built with this block (any of its variants), the highest tiers first, from the game's prefab files.