For a maintenance visit built around a house from this build window, the truck carries torsion and extension springs sized for standard residential doors, replacement rollers in both steel and nylon, cable, and the lubricants and hinges that cover most of what a door built in the 1980s actually needs. What we don't carry is inventory for genuinely obsolete track systems or discontinued opener logic boards - if a part turns out to be that rare, we'll tell you on the spot rather than stall the visit pretending otherwise. Given the cold-severe winters this part of New Jersey gets, we check weatherstripping and bottom seals as a standard part of the visit, since a hardened or split seal is one of the more common findings on a door this age.