It's cheap and it feels like it. The bed frame feels strong enough and doesn't flex. The bed covering is fairly thin steel and will dent/flex. I'd bet the 660 lb rating is for a 660 lb plate of steel the exact length and width of the bed (so the weight is distributed evenly).

But the handle will give out at the base if you try to push too much weight over a bump. Remember to pull while lifting up to clear transitions between flooring types. I'd bet that pulling 660 lbs of weight over smooth concrete would also probably destroy the handle.

Those two quibbles are bad enough but I can work around them. The most annoying thing is the amazingly low quality of the wheels. They vibrate and wobble when in motion and make a huge racket. It's worse with lighter loads than heavier. The problem isn't the casters themselves but rather the bearings used in the axles of each of the 4 wheels. There is just so much play. Fortunately, a quick trip to a hardware store for new wheels will fix this problem.

So why 3 stars for an obviously inferior product? Well, because I'm a results-oriented kind of guy and the truck works.
It's cheap and it feels like it. The bed frame feels strong enough and doesn't flex. The bed covering is fairly thin steel and will dent/flex. I'd bet the 660 lb rating is for a 660 lb plate of steel the exact length and width of the bed (so the weight is distributed evenly). But the handle will give out at the base if you try to push too much weight over a bump. Remember to pull while lifting up to clear transitions between flooring types. I'd bet that pulling 660 lbs of weight over smooth concrete would also probably destroy the handle. Those two quibbles are bad enough but I can work around them. The most annoying thing is the amazingly low quality of the wheels. They vibrate and wobble when in motion and make a huge racket. It's worse with lighter loads than heavier. The problem isn't the casters themselves but rather the bearings used in the axles of each of the 4 wheels. There is just so much play. Fortunately, a quick trip to a hardware store for new wheels will fix this problem. So why 3 stars for an obviously inferior product? Well, because I'm a results-oriented kind of guy and the truck works.