I would not spend over $300 on the "muver" - the center wheels appear to be solid plastic or rubber and not heavy duty enough. In fact, in the video the cart appears to be overloaded and the handler is being exceptionally gentle with it. For that amount of money just get the real thing:
I use one of these and they are fantastic - lightweight aluminum (can be carried) and holds even more (1000 lbs) than what was shown in the muver video. Rolls over thresholds and even a few small stairs. No, you are not going to fit in in the trunk of a car - but, cars were not meant to be delivery vehicles either.
They sell for about the same price as the muver, and you can even find them used for less. I got mine when working a trade show. An exhibitor had one with a split tire and got so fed-up he fed it to the dumpster! I took it home - replaced the tire (~$29) and voila!
I also use a standard version with the longer fold down tongue for smaller deliveries or places where I don't think a platform truck will maneuver easily.
For me, part of the value of my RNR cart is the ability to fold up very compact so it doesn't take up much room in the car.
Another is the weight. About 25 lbs vs 50
Also, having the ability to be long for larger loads.....or short if I need to maneuver around tight corners or small elevators.
No need to have multiple carts
Total weight on my cart has never been an issue.
