In Kern County, deciding on roofing dumpster means deciding on stripped shingles, which are dense enough that roofing containers are deliberately small first. You can avoid the whole headache in Kern County by knowing upfront that nobody knows how many layers are up there until the crew opens the roof, and each one adds tonnage. Debris from Keene doesn't just disappear, it travels to strict diversion requirements and widespread C&D recycling, and that trip is baked into how the job gets scoped.
In West, dry summers with winter rain and a long fire season sets the busy season for haulers, which is worth knowing before you assume a truck shows up on short notice. In Kern County, a 10 or 15 yard container handles most roofing work, sized to the weight of the debris rather than the square footage it came from. Chances are, if you are reading this, you are roofers and homeowners.
The truck headed to Keene started its day in Kern County, and that trip is baked into what gets quoted. No hauler is dedicated solely to Keene; the ones who answer are already working Kern County and the surrounding West. Dirt, concrete, brick and tile carry weight that outruns their bulk, so the container built for this job is shallow and stops loading long before it looks full. Find out if a locking lid or gate is available for a container that will sit on the property overnight in a neighborhood with foot traffic. If there's no room on site and the container has to sit on the street, budget time for city encroachment permits, CalRecycle diversion reporting. The gate on the container swings open from one side only. Leave a few feet of clearance there, not just in front.