Believe it or not, I actually drove one just like it, having worked at a Fedex Ground processing center for about a year. It was a 3-wheel electric model (not propane). One had to be extremely careful with it when entering / exiting the trucks and loading unloading stacked pallets from them. I drove that as well as the "Tug" haulers that went between different stations, picking up and dropping off parcels. Eventually, I also got trained and certified in how to drive the tractor cabs for the half semi-trailers. You did not need a CDL to drive them anywhere "inside" the Fedex private property. You just couldn't drive them "off" the property at any time. Not that they needed to be. The "line" drivers took care of that (the ones that had the CDLs). But you would shuttle the full/empty half trailers between open loading ports in the building and the parking area for them. I would have loved to stay on that job if they had just paid a bit more money. And it was a great job for a young kid starting out and learning how to go to work every day. But not so much for someone who had to "earn a living" and feed a family on that income alone.
That said, and in the spirit of "Men and Boys and the cost of their toys," if I ever do hit the Zillion dollar lottery, I have fantasized about buying one just like I used at Fedex. I'd even build a small warehouse building on my 10 acre plot where I'd store various things that required its use.