For a late-90s steel sectional door, the truck carries torsion springs sized for the common panel weights in that build era, nylon and sealed-bearing rollers, lubricant rated to perform in the cold-climate conditions this region sees through winter, and cable and drum hardware for the torsion setups that replaced side-mounted extension springs on most doors built from the mid-80s on. We also carry photo-eye sensors and limit switch parts, since openers installed alongside doors from that period are old enough now that the original sensor housings crack or drift out of alignment. What's not standard stock: opener circuit boards specific to a particular model line. If your opener's logic board is the problem rather than the door itself, that part sometimes has to be ordered, and we'll say so up front rather than make a second trip look like bad planning.