| More skill than driving with a single trailer | |
| More care when driving in bad weather and on grades | |
| More following distance than driving with a single trailer | |
| All of these are correct |
| Another name for rearward amplification is the crack-the-whip effect | |
| The rearmost trailer is the most affected | |
| The longer the trailers you`re pulling the larger the effect | |
| The more trailers you`re pulling the larger the effect |
| To convert an axle into an additional fifth wheel | |
| To convert a fifth wheel into an additional axle | |
| To couple an axle and a fifth wheel | |
| To convert a fifth wheel into a dolly |