Found this awesome company today called Wishbone Design Studio out of New Zealand that sell these really rad 3-1 bikes and wagons.
Little bit about the products:
The wishbone wagons convert from a classic wagon to a soap-box racer to a foot-to-floor car. They are great for ages 1-10 years of age.
The wishbone bikes allow kids to start riding at age 1 with 3 wheels, purchase then it converts to 2 wheels for kids to learn balance at age 2-3 years and later flip the unique “wishbone” frame to fit ages 4-5. This bike is suitable for kids 12 months to 5 years.
Check them out!