Inspired by rcaf_777 mention of observation posts.
A civilian light truck, used for electrical line maintenance. Has a cherry-picker (AKA aerial work platform, elevating work platform) that's been modified with some armour protection. Vehicle was parked behind some suitable protection such as a hill, berm or even a wrecked armoured vehicle. The platform itself has some spent bullet casings on its floor, along with some bloodstains.
Something "borrowed" from a museum and placed on the battlefield, a World War One fake tree.
These were used as observation posts in No Mans Land but also as sniper posts.
Check the following links for information but more importantly, for some images: -
http://blogs.iwm.org.uk/transforming...mouflage-tree/
https://www.smithsonianmag.com/trave...WWI-180962179/
http://www.eastsussexww1.org.uk/camouflage-trees/
https://historywithatwist.wordpress....world-war-one/
http://www.dailymail.co.uk/news/arti...#axzz2K8hz8ZgZ