For a typical off-track call on the housing stock common to Mableton - steel doors, factory rollers, standard two-car track widths from '80s and '90s builds - we carry replacement rollers, roller brackets, standard track sections, and the fasteners to remount them correctly. What we don't carry is a full stock of every non-standard track width, so an oversized or custom door opening may need a return trip once we've confirmed the exact size on site.
We also carry the tools to check and reset opener travel limits and force settings, since a fair number of off-track calls out this way trace back to an opener that kept pushing a jammed door rather than a hardware failure on its own. Getting the track right and leaving the opener still fighting the door isn't a finished job.