Collapsible wagon tailgate

A collapsible wagon, comprising:

• a wagon frame assembly having a rear frame;
• and
• a collapsible tailgate frame assembly coupled to the rear frame, wherein the tailgate frame assembly comprises:
• a tailgate platform having a pair of side rails, each having an end pivotally connected to a corresponding bottom portion near a base of the rear frame of the wagon frame assembly;
• a wheel support frame pivotally connected to a corresponding one of the side rails;
• a slider slidable along each of the pair of side rails;
• and
• a first connection member pivotally connected to the slider and the wheel support frame, and a second connection member pivotally connected to the slider and the rear frame, wherein for each side rail, the first connection member has a first end pivotally connected to the slider and a second end pivotally connected to the wheel support frame at a location below the corresponding side rail, and the second connection member has a first end pivotally connected to the slider and a second end pivotally connected to a location of the rear frame below the location of the corresponding bottom portion of the rear frame at which the end of the side rail is pivotally connected to the bottom portion near the base of the rear frame,
• wherein the tailgate frame assembly transitions between a collapsed state and an extended state with each slider sliding along a corresponding side rail.