1a. semi-skilled labor individually secures each and every truck to its flat car for safety. Figure 8+ hand-tightened heavy chains or freight straps per truck.

2a. if any mistakes were made during step 1a, then this train, flat car, and truck may enjoy 15 minutes of fame on the evening news.

2b. semi-skilled labor individually removes the heavy chains or freight straps from 1a, and stows them away.

America's railroads looked very seriously at doing this, back in the day. The economics really didn't work out. There is a sorta-similar concept that's still used - https://en.wikipedia.org/wiki/Roadrailer