You can only load 11 cars these days depending on model mix because with cars getting heavier it puts the drive axles overweight. XRs and TEs, plus Ghias, Fairlanes get loaded at the very back for that reason. A good mix on most trucks will scrape through with all 12.
You wouldn't load these trucks like in the photo because I can bet it's over 4.6m high and 25m long. Bad news with the RTA....
Imagine what twisted mind designed this setup.