Loading Heavy Stones onto Cart

What happens here

The presenter begins loading large, heavy, irregular flagstones from the back of a pickup truck onto the 'Chore Warrior' cart. He highlights the cart's design feature: its fold-down sides, which allow for these bulky and non-uniform items to be placed flat on the cart's bed. He chooses to keep two side walls up and two down to accommodate the stone shapes and sizes.

Goal: Load large, irregular stones onto the cart using its flexible design.