I am working on a whole range of coal hoppers since that's my main area of interest. They are older (pre-1970s) though. Not sure if that is what you are looking for.
The USRA 55ton one is the closest to being finished I guess, but the trucks, hoses and couplers are not mine. They belong to lilb, but I'm not sure what's up with the libraries he released since the thread got shut down when people wouldn't behave. Mainly, I don't know if it's just the scripts or if the actual hose, truck, and coupler mesh as well. Anyways, here is an old picture of them in a not exactly prototypical paint scheme and before I fixed the shadows.
http://hostthenpost.org/uploads/e20271afb94d98c703e1f6686c705ec4.jpg
I think I have a B&O and Reading scheme done that are actually prototypical, but they are on my old laptop.
I also have a 70t hopper, Southern Big Red 100t hopper, N&W H11 hopper, and a Southern Silverside gondola in various stages of completion. Ok, so that last one isn't a hopper, but it was used for hauling the same stuff. The 70t and Silverside have been mapped and are awaiting textures. The Big Red and H11 are still a good deal away since I got bored with the hoppers and started working on an SD35 instead.
Not promising anything here, but just letting you know that you're not the only one looking for hoppers. If people were interested in them I'd be more dedicated to finishing them, but it seems like the current trend is modern Western US stuff.