For sale is a 3D printed rung ladder for adding to an Ertl gravity wagon. The extension hangs off the rim of the gravity wagon and can be painted to match your wagon, or left as is.
Gravity Wagon Rung Ladder - Ertl - For Gravity Wagons with Extensions
Gravity Wagon Extension - Ertl - For 680/760 Gravity Wagons - 64th Scale
Gravity Wagon Extension - Ertl - For Gravity Wagons
Gravity Wagon Extension with Cutout for Corn Picker - Ertl - For Gravity Wagons
1/16 E-Z Trail Gravity Wagon Limited Edition From Speccast
Spec Cast 1/64 Unverferth 630 Green Gravity Wagon UBC-057