Update: There was an error in the cement trailer that would cause a CTD (Crash to Desktop) this has now been fixed. – 21:31 UTC
I’ve decided to make a few updates to the Marshalls PLC (with cargo) mod for FCP replacement.
The mod now includes three new trailers with one cargo each.
Construction Supplies
Cement
Coloured Aggregate
Please note because of the internal changes, this may cancel your current job even if you are replacing it for my old one.
IJ's Mods 
Did you do this for someone who requested this or do you live around Southowram/elland as thats where they are based
You see them quite often pulling Stobart trailers.
That said my dad has worked for Marshall’s at Brookfoot for a good 30 some years now.