I received a package from Japan a few days ago that included the TomyTec auto carriers. While the UD tractor that came with the trailer looks good, I wanted to see what the carrier would look like with a 1:160 scale tractor and 1:160 scale cars. So, I replaced the UD with a Trainworx KW W900A (Secret Weapon Mike's) and added six Atlas Ford Taurus sedans. The black Taurus on the top rack rolls to freely to stay put on its own, so the white Taurus is bumper to bumper with it to keep as far forward as possible.
The single axle trailer with single wheels (rather than tandem axle with dual wheels) seems unlikely to be found carrying six automobiles in North America. Also, the overall height is probably a bit excessive.