Sumner Insurance is a full services brokerage offering a full line of car insurance and homeowners insurance products, both personal and commercial lines. Our insuring coverage area includes the entire states of California, Arizona and Nevada. Affordable Auto Insurance and More. Our company offers the most competitive insurance rates for personal car insurance, homeowners insurance, renters, trucks, motorcycles, boats, watercrafts, mobile homes, motor homes, travel trailers and Mexican insurance, in addition to business and commercial insurance for all auto, trucks, general liability, and property.