In our tests, we found all sorts of uses for the hook-on harness and extendable arms, and we even modified the cart by attaching the Aerocart wagon kit (sold separately) to use it in four-wheel mode.

This battery-powered, four-wheel cart is made out of what [Chris] could find. The frame is made out of 50x50mm angle iron that’s welded together, with the body panels fabricated out of ...