For a maintenance call on a house this age, the truck carries what a 1990s-2000s door setup typically needs: nylon and steel rollers, standard-gauge lift cables, extension and torsion springs sized for residential double and single doors, opener logic boards for the drive-chain and belt systems common from that build era, and general hardware - hinges, brackets, fasteners - sized to what went into houses built through the early 2000s.
What's usually not on the truck, because it's rarely needed here: the older one-piece door hardware or the odd-sized torsion springs that show up on pre-1970s houses. That's a different job with different parts, and it's not what we expect to find on a routine visit to this part of town. If your door turns out to be older than the neighborhood's typical build year - a replacement door installed on an older lot, say - we may need to come back with different stock, and we'll say so rather than force a part that doesn't fit.