Powered wheelbarrow - GIF
Powered wheelbarrow. Much as the GIF presents this as a recreational vehicle, it looks extremely useful to me, as long as it functions half this well with a full wheelbarrow load.
https://s3-us-west-1.amazonaws.com/h...heelbarrow.gif
This reminds me of our own kenrizza's excellent Lawnmower Powered Wheelbarrow:
https://s3-us-west-1.amazonaws.com/h...heelbarrow.jpg
This is one of the less-developed frontiers in homemade tools. Store-bought powered wheelbarrows are incredibly expensive, and a homemade version is not the easiest tool to develop and use regularly.