CarTrailer by bendoe is a trailer especially for car transportation, but other cargo are defined too!
All parts are in this mod. Tested on 1.20.x and 1.21.x. Maybe this mod does work under 1.18.x and 1.19.x too.
As example, you’ll find the CarTrailerChromSkin.scs. Use this example to make your own skins. You can change the material-properties too.
Enjoy and have fun with it.