I made around 11000 km with a belt on a cargo bike before selling it and the belt on the current one is at ~6000km. Belts are amazing, especially when it comes to maintenance.

But I would still avoid going with a belt on a tour anywhere that’s remote - not because the belt itself might break, but the hub (as for this guy), or a sprocket or anything that is uncommon, but required when riding a belt.

Problem is that if anything else breaks you're pretty fucked if there is no good bike repair shop nearby.

Chain can go few k already so just getting it replaced at start of big trip is enough

I would guess the Priority 600X adventure: https://www.prioritybicycles.com/products/600x

As far as I know, that's the only mountain bike sold with a pinion + belt drive stock.