Max Gruber's "Little Eva"

The photo above, taken in 1930 appears to be Little Eva from the Max Gruber offering, as the trike looks to be the same as in the photo below.

From the "history channel"

From Dick Flint

The Elephant's Tricycle
Max Gruber (1877-1939) brought his act to the US in 1908 to play vaudeville but later appeared as well with the Herbert Kline carnival (1911), Buffalo Bill, and center ring on Tom Mix (1936-37). His act first featured Minnie the elephant, (acquired in 1899), a horse, and a Shetland pony. This earlier act is seen in photos 1-3 posted by Buckles on Sunday. While appearing with a Mexican winter circus in 1919-20, he sold the act to the show and stayed on as their animal trainer. Probably during the winter of 1925-26 Gruber acquired Minnie II, a three-year-old elephant, but she soon died. Then came Little Eva, another three-year-old elephant, who was joined by Topsy, a two-year-old zebra, and Ringo, a Great Dane, to create the "Oddities of the Jungle" act. The act moved in a custom-built moving van built about 1927 by Fitzjohn, a bus body manufacturer, on a chassis likely made by REO (both were Michigan companies near where Gruber lived). This truck was shown in Buckles photo #4 posted Sunday. Eva would make frequent PR appearances including pedaling her huge tricycle down the main street of the towns they visited. Gruber retired in 1938 and sold the act to Bud E. Anderson of Emporia, Kansas.