Tiny Trailers v1.0
Tiny Trailers Mod
Visit the trailer dealer, you should find the trailers.
You can change both paint and wheels for the trailers, but thats it.
To attach the trailers, either F7 or spawn the trailer in same garage location as you're currently in, this may involve relocating the trailer.
Dry Freighter 1 Axle
Dry Freighter 2 Axles
Steel Flatbed 1 Axle
Steel Flatbed 2 Axles
You can still use these for Cargo and External Market with no issues.