I believe a lot of it is the quality of the rubber hinge material. I know the ones I replaced lasted over ten years, but I never tried to buy the cheapest material I could find either.
Bob, I wonder if they are waterproof? Otherwise it would be possible to get a lot of water in the bays.
The easy way to do it would be to put a piece of canvas or vinyl awning material under the door and connect it to the body, attaching it with screws.
Sure is alot easier to just replace the rubber one
Bruce, tell me, would you rather push a piece of rubber into a slot or put a SS sliding hinge into each end of the slot?
these hinges are direct replacements for the rubber, not a piano hinge that needs to be attached on each side.
That's why we have these forums, to discuss different ways of doing a particular job.
Then, too, why be a nay sayer until you have experience with a particular product.
It seems to me, I've replaced the "Buffalo hinges" every 3 or 4 years on the outside, and normally about every two years. I've never, ever had to replace the SS hinge material.