The trade-off in Shafter is rarely price versus size. It's convenience versus where you're allowed to place it. Because Shafter sits in Kern County, the company assigned to your street sets the timeline โ that's a different question than which company is closest. A container's weight limit exists apart from its size, so a smaller box loaded with brick can hit its tonnage cap sooner than a larger one filled with something light like foam insulation.
Availability in Shafter tracks Kern County as a whole, since one hauler's trucks rarely stay inside a single town's limits. Shafter's size in California means fewer operators cover it, and that scarcity is the price paid for being outside the state's busiest metros.
California sees dry summers with winter rain and a long fire season, and that is the real reason some weeks here book solid while others sit open. The container is the easy part. The harder number to see is what strict diversion requirements and widespread C&D recycling charges once the truck arrives. The moment the container leaves private property for the street, city encroachment permits, CalRecycle diversion reporting enters the picture. The line that matters isn't the size of the container, it's the property line it sits behind. Cardboard and scrap metal often get pulled out and recycled separately if they're set aside instead of buried in the pile.