Expect to be seeing them in the next 4 years.
I never saw an Amazon truck until this year.
I see them every day now. I deliver to a town of 30,000. They even deliver to towns with less than 200 people and the surrounding ranches.
We are talking exponential growth...doubling their in house distribution every 3 years or so puts their distribution facilities at 1800 (Ups's current number of facilities) in 9 years.
As of November of 2018...
One of these ( Amazon) fulfillment centers is likely very close.
According to Cooper Smith, an analyst at L2 Inc., a New York-based business-intelligence firm, Amazon “now has warehouses within 20 miles of half the U.S. population.”