Collaborative transport

Using Coordinated Task Sequences: Two objects transporters collaborate to deliver a box. When they arrived they both MUST wait until a crane discharges one of them which actually contains the box, delivers its content.
But, in the model I have when they both arrive one of them leaves immediately before waiting the crane to discharge the container which is inside the other one. The empty truck leaves.

Anyone know a trick for that?

You may use insertsynctask(obj tasksequence, num taskkey) in your coordinated task sequence and set taskkey to the crane loading task. This will hold other resources until the load is done. For example

stask = insertproxytask(cts, cranekey, TASKTYPE_LOAD, boxitem, transporter1key , 0, 0, 0, 0);
insertsynctask(cts,stask);

Thank you indeed for your comment.
The issues is that not all this is going to be decided at the same place.

a processor tells the transporter to deliver this to certain network node or any other location and wait to be discharged.
Then the crane needs to find location where it want to put the box.

If processor decides for this, it happens that before the box arrives at crane the place is already occupied by the transporters who arrived before us.

So one way is to stop the transporters at the quay crane and then put some script for transporter to release/deallocate them.

what would be the best strategy here.

thank you in advance.

If the crane receives its own task sequence to travel to the transfer location and If you don't know who from the crane or the transporters will arrive first then you will need to stop each one once it arrives at the location. When both are there, just resume each one.

This may be the best strategy regarding flexibility and availability of resources because transporters and cranes are managed independantly until every one is ready for box transfer.