I realize this video has been up for nearly 3 years, so maybe you're not monitoring the comments. I saw a version of this mini dumper that had a blade attachment for plowing snow or loose material like gravel. That seems like a perfect attachment for this kind of machine. You could spread out the pile after you dump your load. Or you could fill it with sand for weight and push snow out of your driveway. A ripping tooth might be an interesting addition.
How much would the independents steer add to the sales price. If it would double the cost of the wheelbarrow . Then it's a good design. If the added cost of designing a skid steer would only increase the cost by 300 t0 500 dollars then you may have a point