CreS

Also, more deeply than Nameless, you can use the following native:

 

Nice script, @Mos.

The idea is very good, but, as a feedback, I tested some corner case scenarios and found the following bugs:

1) I tried to load another "flatbed" on the one that I was driving. There comes a bug, cars starting to fly. In fact, the problem is not that I loaded another "flatbed", the problem is with big volume cars, even with ambulances.

2) Tested the script with some boats and this is not loading them: attaches the rope to the boats, starts to pull, but in the final point the rope dissapears and the boat remains unattached.

3) Some cars appear to be flying when loaded up (try for example "xa21").