For a service area where houses skew newer, the truck carries more torsion stock than extension stock, sized for the taller, heavier two-car doors that are standard on homes built from the late 1980s through the 2000s. We carry springs in a range of wire gauges and wind lengths because a torsion spring sized for a 7-foot door won't balance an 8-foot one, and guessing wrong means a second trip. We also carry matched cable, bearing plates, and the center and end bearings that wear out alongside a failing spring but rarely get mentioned until the tech is already under the door. What we don't carry is a universal spring that fits everything - that doesn't exist, and anyone who tells you otherwise is quoting before they've measured. If the drum or shaft is bent from a spring letting go hard, that's a parts-order item, not something off the truck, and we'll say so rather than pretend we can finish in one visit.