Re: immobilized vehicles
Only if they are core and you fix them in the repair screen.
Fixing a tank track takes hours, well beyond the scale of the game. Think about the last time you called in a roadside repair organisation when your car required it e.g. to say change a tyre.
You can however pick up a disabled tank if you have bought a tank transporter unit, once it has made it to the breakdown location.
If it has broken down in a hot zone and is in danger then it is often best to dismount the crew and get them out of there. This is especially true of core crews in a campaign who may have hard-won experience.