Forge v14.23.5.2810-1.12.2
Vehicle v0.36.1

Here's what I know:

• All trailers render as purple and black cubes, but the Vehicle Trailer, bikes, planes, and cars render normally.
• The Vehicle Crates also renders as purple and black cubes when placed.
• The Seeder and Fertilizer Trailer's inventories can be opened, but the storage trailer cannot be opened.
• I can still interact with the tow bars, although they are invisible.
• Only the wheels and any tow hooks (Storage Trailer) render.
• I can pick up all vehicles, but they render invisible.
• Nothing is printed in the logs when they are placed.
• Waila can't see these trailers.

• Top left: Storage Trailer
• Top middle: Seeder
• Top right: Fertilizer
• Bottom middle: Vehicle Crate as it is opening.

Usually when missing models occur, it will print an error in the logs. Can you send me your startup logs?

Here is the log.

Can you try manually reloading resources? F3 + T when in game. Does it show the trailers after that?

I'll see what I can do, but I have a big modpack, so it takes a long time for it to reload resources. I suspect though that it's another mod's interaction causing problems with it.

I finally found out that the render glitches are caused by the mod Baublelicious.