MRR Trinity 4-Bay Covered Hopper
A true modern behemoth of a hopper, this is the actual biggest hopper that the fictitious Meier Rail Road owns and operates in revenue service.
And, In-real-life, Trinity Rail did indeed build these, and presumably still does, but they are considerably rarer than the more standard (but slightly smaller) three-bay hopper.
You can use this for your own projects. I prefer credit, but only to see what you guys come up with. Not anything serious.
One last note: This was heavily based off of MrThomasTheCat's hopper. However, I decided since his hopper was slightly out of scale, I would fix it and make more variants. MrThomas, I hope you don't mind.