Welcome to Cross of Iron, a Company of Heroes modification that aims for a better gameplay experience without making significant changes to the original CoH gameplay.
An Opel Blitz with two engineers. Repairs only in the sector in which it is deployed. The repair rate is twice that of 'Advanced Repair', but can only be deployed once.
Repairing your tanks in the field. It's kind of like the Wehrmacht repair bunker, you build the truck, drive it out to where you want it, and order it to Setup. It locks down and becomes immobile and deploys some repair pioneers who will automatically repair any of your own vehicles that stop close by.
You should be able to re-deploy it in another sector, and that also applies to the medical halftrack. Dunno, it's just make life easier.