A container ordered for one room of debris in Wittmann rarely stays that size once the job gets going. Wittmann doesn't have its own dumpster fleet; every truck reaching your curb starts from a yard somewhere else in Maricopa County. A container rated for a certain size still answers to a scale, and that scale doesn't care how much empty space is left on top.
Smaller markets like Wittmann run on fewer trucks, so the container that shows up may have driven in from another county to get there. Ask about availability in Arizona and the honest answer starts with desert heat with a summer monsoon season.
1970s-2000s tract housing across the metros housing surrounds most job sites in this area, and that vintage decides whether a load runs light or dense. No driveway space changes the plan: expect municipal right-of-way permits and heavy HOA involvement to factor into delivery timing. Weekend demand across Southwest is heavier than weekday demand, since most DIY projects start on a Saturday. A driveway placement is the homeowner's decision alone. A street placement becomes Wittmann's decision too. Liquids -- paint, oil, solvents -- need to be dried out or solidified before they go in loose; a hauler can't take what could spill in transit.