Across the roughly 431,668 households this service area covers, the parts that get stocked on the truck are the ones that match what's actually on the walls - and in Bartlett that's mostly 1990s torsion hardware: standard-wind springs, galvanized cable, steel rollers, and openers from the chain-drive era through early belt-drive units. That's a narrower, newer band than some of the older pockets of the territory, which is good news when a part needs replacing same-visit instead of ordered.
What we don't carry on the truck is anything custom - a specialty insulated door, a non-standard track width, or an opener board for something discontinued before the '90s. Those get special-ordered, and that's the honest limitation here: a stocked-parts repair moves fast, a special-order one doesn't, and there's no way to make that faster by driving closer.