These models are all built from a 1919 #9003 Outdoor Wheel Toy. Gilbert introduced the Wheel Toy in 1919 in two styles of sets: New Wheel Toy with wooden parts and Outdoor Wheel Toys with all steel parts. Here’s a picture of the smallest Outdoor Wheel Toy set, number 9003.
The OWT manual showed four toys built with the No. 9003 set. The featured model was the 2-wheel glider. It also built a hand truck, dump cart and a wheel barrow. Note that the last two models used the set box as part of the toy.