(cuz I would not trust HF with spare parts availability)
Actually, their replacement parts program has gotten significantly better in recent years:
Harbor Freight Parts - https://www.harborfreight.com/parts
It isn't a straightforward online process - you have to call them, but I got some replacement drawer latches and it was pretty painless just following their directions on that page.
I'll start by saying I certainly don't have the money for the tool truck boxes. And even for a professional, those boxes aren't making you any money unless you're in a very high end shop attracting high dollar clients who are going to be impressed by such things. If a box is functional, that's the main thing.
Years ago I went around looking at the various "consumer grade" boxes - Craftsman, Harbor Freight, Husky, Kobalt, etc. This was a bit after the Gen2 HF boxes were introduced. For the money, at list price the other stuff really couldn't compete. If you were getting better than the HF boxes, you were paying quite a bit more. Yes, there were sales and deals, but those are YMMV things - like being able to get a good deal on a used box. You have to wait and do the legwork to find them.
Over a few years I went with a 56" Gen2 roller, a side locker, a couple 5-drawer carts, and a couple side cabinets on the carts. That's another thing I like about the HF stuff. It works together and has a common style. The other stuff they're constantly changing styles and sizes. If you buy a roller this year, you're not quite guaranteed that the top cabinet in a year or two will fit or match. Yes, I know the HF Gen3 stuff made some style changes that are going to look different put together, but they did make the effort that they all still fit together with the Gen2 stuff.
Over the years the only thing I've broken was a couple drawer latches. The casters all have held up and drawer slides as well. Use things sensibly and they'll last. I think the issues you get into are in shops with multiple users where nobody "owns" the box - then they get abused and things fail. I see that with the tool truck stuff too, but then you get "free" repair parts. Of course, you could buy multiple "consumer" boxes for the price of a tool truck box...
Another thing to check out is the ICON scratch and dent sales:
Scratch and Dent Sale - Harbor Freight Tools - https://www.harborfreight.com/scratch-and-dent-sale
They range from 25% off for "excellent" (minor scuffs) condition to 35% off for "great" (minor scratches and dents, missing accessories) and 40% off for "good" (moderate scratches and dents, missing accessories). They do a pretty good job of taking pictures of the damage so you can judge for yourself. Again, you have to call them and can't just order online. I'd have considered it if it was available when I got my Gen2 56" box.
I have to say that HF has really upped their game in recent years. For the consumer stuff, I really feel that they're the best value out there.
Tell that to all the people that get crushed to death every year by cheap tool boxes that fall over when the drawers are opened.
Not to discount that there are accidents, but a lot of the time that comes down to using some common sense. The times I've seen a toolbox tip have been when someone was doing something sketchy - and one of the times it was with a SnapOn box that they didn't latch the drawers.
