Here’s a site from the German insurance industry about load securing.
English is selectable right at the start. There is an extensive section dealing with load securing, with police photos showing what they found, and what they expected, during stop-checks.
It helps if you know where the goalposts are!!
For those doing TIR work, this is the one to have (You also need Adobe reader)
http://www.unece.org/trans/bcf/tir/handbook/english/newtirhand/TIR-6Rev2EN_Bookmarks.pdf
This is downloadable and printable, but check your printer paper first 