I had one of those - not sure of brand - but looked exactly like the red one in the picture... same tailgate and all.
I beat the heck out of that thing for several years. Never could quite kill it. I hauled TONS of sand in it, rocks, gravel, manure, you name it. I got my money's worth out of it several times over.
The only mods I did to mine were to put a piece of 1/2" plywood down for a floor, and to weld it in select places rather than relying on just the bolts.
Just bought another cart this weekend after being without mower/cart for the past 6 years (I was renting – just bought a house again, finally). Anyway – got a Harbor Freight cart this time. Seems sturdy, but I will have to work on the rear gate… I liked the design of the previous one a LOT better. This one looks like it will not work very well when dumping full loads.