Sorry, I guess I should ave been more specific.
In the above example and using rule 7.3 Platoon and Section Command Control could the trucks share a MOVE command with Infantry units from a different Platoon from that which they they arrived with?
I know the answer would be the same for any command but it's the possibility of saving a command when loading up Infantry and driving away I'm thinking of in particular here.
No, they couldn't. This optional ruled further refines section 18.104.22.168 Determining Available Commands to a an even finer level. Just one additional point to also keep in mind is that transported units aren't given a command.
This optional rule really places a great deal of restrictions on units and the command process. It makes command units critical to the process.