Mostly, you have seen transporters that have two wheels like the hoverboard, and the Segway. The difficulty lies on balancing the device since it got two wheels. Thus, four wheels is much stable.
You saw this that looked like what Amazon is using in their warehouses. The main difference is they are used for transporting heavy loads for warehouse use and it has AI. Mine’s a consumer device that you can use for transportation.
The construction is simple and it needs some shock absorbers for terrain adaption. There is a cable that you can hold and press buttons to move forward, right and left. Yes, it has ‘tank’ like wheels but is limited to four for conservation. I didn’t do the math if it needs a 24 volts motor or 12 volts should be sufficient.
Basically, this is just a rough draft of a cool idea.
Fernando L. Cuevas Jr.