WotLK vehicles and loss of focus

[Deekhay]

Dont think its a loss of focus issue to me, its more like a loss of follow for me.

They still follow as I told in my post. It's just that if they lose follow for some reason they won't follow again.
I think that on the other hand you cannot assist, target focus, etc even if the good unit is set as focus. It's like the unit being in another continent.