just to give you an idea... im gonna remake most of my older props and trailers, since over time i managed to improve my texture-"painting" and uv-mapping efficiency alot so the older ones arent quite up to date.
especially with acess violations "trailer variation loader"-mod which enables alot of possibilities im gonna release a remake of my older ROOS wood carrier trailers soon.
maybe even today if im fast enough.
next up after that will be FALNS coal hoppers and EANOS-remake which will cotain alot of variable cargo (thinking scrap metal, coal, sand, etc)

yeah, it would make them quite heavy performance-wise, but as these would be props and everyone could place as many of them as he likes it wouldnt be necessarily a problem.
I'm excited to see whats coming :D

@robtox yea i thought about that but it would be alot of work to fit the geometry.
also the face count would get alot higher which hinders performance even more...
maybe in the future but right now im putting together a concept of something very new.

*cough* trans-ant *cough*

Awesome, thanks a lot! I really like these trailers and even thought to create them on my own - thats no longer necessary as I see.
One idea I had to these trailers is to make an open prop-version with a fitting forklifter etc for nice (un-)loading scenes. Maybe you want to try that. :)