No family arguments on here please!
As always seems to be the case nowadays, there are several YouTube vids on every subject, in this case showing how to use a Fuller Roadranger box. Here’s one-
https://m.youtube.com/watch?v=qisr-ryn_V8
Now looking for Scammel video....
Mmm, nothing found, but nice bit of history on Scammel.....
http://www.scammellregister.co.uk/index.php/history