Lately, i've seen a few newer Doosan's. They still use a weak system of mounting the mast to frame, that failed on older models. Instead of a trunion bearing cap like most other brands, they have a half moon design where the mast pivot shaft is just sitting in a groove, with 2 bolts going through it. This design led to many trucks being scrapped after a collision with mast to racking. That is the only I see on late model Doosan's that could be an issue.
I'm sure there are big improvements from 2006.
It should be less difficult for you to get parts if youre in Korea now!