Junior will be the envy of his friends if you build him his very own chariot, as shown here in the November 1938 issue of Popular Mechanics.

The design is simplicity itself.  You just need an old set of wheels and axle, and attach them to the bottom.  A 2×4 and a couple of pieces of pipe serve as a towbar, allowing two of Junior’s lucky friends to pull him around the yard.  The reins are a nice touch, and I’m sure the friends appreciate them.