I gave $650 installed back when I got mine.
It was that or get a fiberglass bed cover for that truck, that was what I was deciding between. The cover was going to need paint and then I couldn't haul certain loads.
The box is plenty strong. I always stand on it when cleaning the truck so I can reach out over the roof.
I've had mine for prob over 5yrs and it's never leaked in storms or car washes. I used to strap a sportbike in the bed of the truck and have the front tire pushed into the toolbox. It never bent the metal where the bike was pushing into it. Have stacked square bales on top of it several times also. The only spots on my box that are worn through the paint is from a large Miller welder/gen that was sitting next to it. Some bolt heads on the welder rubbed against the box.
They are strong and good quality. My only complaint is that mine is getting older and the gas struts are starting to sag. They can be easily replaced, I'm lazy