Haysville Valley Mercantile Deliveries was a business which was established in Haysville in 1905 in the alternate timeline where Edna Strickland accidentally burned down Hill Valley in 1876.
William McFly worked for the company in the 1931A timeline. He was seen driving a truck that bared the name.
In the restored 1931 timeline, the business was nonexistent as the company was established in Hill Valley. In its place was Hill Valley Mercantile Deliveries.