> These things will effectively last forever, as each part can be replaced as needed.

You will find that Toyota comfortably holds this niche in most developing countries. Toyotas are reliable, and there's a glut of cheap Toyota spares due to network effects. The only advantage the Ox has over a Toyota Hilux is that it can carry about 800kg more (about double). On all other points, the Hilux is ahead or on par.

There's a caveat... it's the old, pre-2000s Toyota Hilux cars that are durable and easy to repair. A newer Hilux isn't as simple and reliable as the old ones, and the old ones are in short supply.

Although the new Hilux cars seem to be quite popular in Africa and Middle East too. Perhaps it's the brand, or perhaps there are some similarities (or even interchangeable parts) that make it desirable.

Potential buyers in developing countries don't just take broken cars to the fancy service stations to get them fixed by the licensed mechanics. They do most of repairs themselves with whatever scrap parts they can find for few bucks. I really, really doubt Ox could provide cheaper spare parts. Also, for big portion of people around the world that have no stable income and access to credit, it's much easier to pay 2k$ or so for an old truck and and get additional money for repairs when it's needed (or even buy another 2k$ truck) than paying 10-12k$ even if that means zero expenses (which is unrealistic) over time.

The thing is made with a steel tube frame and plywood panels. And if you look at the pictures there's a lack of compound curves. So it seems to me that a lot of repairs can be done in a very basic workshop, without having to order spare parts from abroad.