Thanks for the report. I know. It sucks. I am mostly powerless to do anything about it.
There are extremely few non-vanilla wagon assets available for 2.0 that DO have sloped sprites (no more than 3, 2 of which have license restrictions, and the last one doesnāt make any sense on Rubia). I spent a very long time searching for good sprites prior to Rubiaās launch. Current wagon sprites are derived from Yuoki (without whom weād be totally screwed!). These sprite sheets lack slope sprites because they were made before elev rails, and they lack have the loading door sprites. Despite this, I am grateful for his sprites.
If someone is able to provide more complete assets, I would be glad to see if I could incorporate them into Rubia. But given train sprites take a huge amount of time to create, I doubt I will come across such a generous person.