Can of worms here. What you need by law and what is reccomended are two different things.
To be fair most of it should be supplied by your boss as its his truck. Most of what applies to you is as someone said, Health wise/Glasses/spares etc.
Also depends on countries, as most accept UK identifiers on number plates, Spain for example do not, Hence the UK sticker.
UK identifier, Angles mort stickers, Euro class windscreen sticker for nearly every country if applicable. Speed limits on back.
Personally i run Uk identifiers and Euro class and thats it. Dont like covering my kit in ugly stickers, il deal with the fines should they ever happen, which up until now they never have.